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Chemical reactions and Equations

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Quiz 1 : Chemical Reaction and Equations

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Question 1 of 20

1. Question
4 points
Which of the following are chemical changes ?

          (i) Digestion of food

          (ii) Liquefaction of air

          (iii) Ripening of fruit

          (iv) Dissolution of sulphur in carbon disulphide

          (v) Freezing of water

          (vi) Electrolysis of water
- (i) to (iv) all
- (i), (iii) & (vi)
- (i), (iii) & (iv)
- (iii), (iv) & (vi)
Correct

Incorrect
Question 2 of 20

2. Question
4 points
Which among the following is not a physical change ?
- Melting of solid to liquid.
- Vaporisation of liquid to gas.
- Liquefaction of gases to liquid.
- Decay of matter.
Correct

Incorrect
Question 3 of 20

3. Question
4 points
Which of the following is a decomposition reaction ?

          (1) NaOH + HCl → NaCl +H₂O

          (2) NH₄CNO → H₂NCONH₂

          (3) 2KClO₃ $\underrightarrow { \quad \Delta \quad }$   2KCl + 3O₂

          (4) H₂ + I₂ → 2Hl
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 4 of 20

4. Question
4 points
Which among the following is not a chemical change ?
- Melting of ice.
- Carbon cycle.
- Dehydration of substances.
- Fermentation of substances.
Correct

Incorrect
Question 5 of 20

5. Question
4 points
Physical changes are usually _______ in nature.
- temporary
- permanent
- irreversible
- endothermic
Correct

Incorrect
Question 6 of 20

6. Question
4 points
An example of a chemical change is _________.
- formation of clouds.
- glowing of an electric light.
- dropping sodium into water.
- dissolving of salt in water.
Correct

Incorrect
Question 7 of 20

7. Question
4 points
Which of these will cause a chemical change to occur ?
- Grinding of wheat into flour.
- Lighting of a gas stove.
- Evaporation of water from a lake.
- Ringing of an electric bell.
Correct

Incorrect
Question 8 of 20

8. Question
4 points
Chemical changes are _______________.
- temporary, reversible and a new substance is produced.
- always accompanied by exchange of light.
- permanent, irreversible and a new substance is produced.
- never accompanied by exchange of light and heat energy.
Correct

Incorrect
Question 9 of 20

9. Question
4 points
Which of the following is a physical change ?
- Solubility in water
- Combustibility
- Aerial oxidation
- Reaction with water
Correct

Incorrect
Question 10 of 20

10. Question
4 points
Formation of carbon disulphide from carbon and sulphur takes Place by
- Absorption of heat
- evolution of heat
- no change in heat content
- None of the above
Correct

Incorrect
Question 11 of 20

11. Question
4 points
In the equation

Cu + xHNO₃ → Cu(NO₃)₂ + yNO₂ + 2H₂O

The values of x and y are
- 3 and 5
- 8 and 6
- 4 and 2
- 7 and 1
Correct

Incorrect
Question 12 of 20

12. Question
4 points
Which of the following chemical equations is an unbalanced one ?

          (1) 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

          (2) 2C₄H₁₀ + 12O₂ → 8CO₂ + 10H₂O

          (3) 2Al + 6H₂O → 2Al(OH)₃ + 3H₂

          (4) 4NH₃ + 5O₂ → 4NO + 6H₂O
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 13 of 20

13. Question
4 points
In the reaction given below a, b, c and d respectively are

aFe₂O₃ + bH₂ → cFe + dH₂O
- 1, 1, 2, 3
- 1, 1, 1, 1
- 1, 3, 2, 3
- 1, 2, 2, 3
Correct

Incorrect
Question 14 of 20

14. Question
4 points
When ferrous hydroxide reacts with hydrochloric acid, __________ and H₂O are produced.

(1) FeCl₃ (2) FeCl₂

(3) FeCl₄ (4) FeCl
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 15 of 20

15. Question
4 points
Which of the following is a combustion reaction ?
- Boiling of water
- Melting of wax
- Burning of petrol
- None of these
Correct

Incorrect
Question 16 of 20

16. Question
4 points
The reaction, H₂ + Cl₂ → 2HCl is
- an oxidation reaction
- a reduction reaction
- a combination reaction
- an isomerisation reaction
Correct

Incorrect
Question 17 of 20

17. Question
4 points
Decomposition of water is
- electrolytic
- thermal
- photolytic
- All of the above
Correct

Incorrect
Question 18 of 20

18. Question
4 points
Which of the following is not a decomposition reaction ?

          (1) CaCO₃ $\underrightarrow { \quad \Delta \quad }$ CaO + CO₂

          (2) 2KClO₃ $\underrightarrow { \quad \Delta \quad }$ 2KCl + 3O₂

(3) Digestion of food in body

          (4) H₂ +Cl₂ → 2HCl
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 19 of 20

19. Question
4 points
Lead nitrate on heating gives
- Lead oxide
- Nitrogen dioxide
- Oxygen
- All of these
Correct

Incorrect
Question 20 of 20

20. Question
4 points
Heating limestone produces
- Quick lime
- Carbon dioxide
- Both (1) and (2)
- None of these
Correct

Incorrect

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Quiz 2 : Chemical reactions and Equations

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Question 1 of 20

1. Question
4 points
When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction is SO₂ + 2H₂S → 2H₂O + 3S. Here hydrogen sulphide is acting as
- an oxidising agent
- a reducing agent
- a dehydrating agent
- a catalyst
Correct

Incorrect
Question 2 of 20

2. Question
4 points
CuO + H₂ → H₂O + Cu, reaction is an example of
- Redox reaction
- Decomposition reaction
- Neutralisation
- Analysis reaction
Correct

Incorrect
Question 3 of 20

3. Question
4 points
When a chemical species loses one or more electrons, it is said to have been
- oxidised
- reduced
- remain unchanged
- hydrolysed
Correct

Incorrect
Question 4 of 20

4. Question
4 points
Combustion can be considered as
- oxidation
- reduction
- decomposition
- All the above
Correct

Incorrect
Question 5 of 20

5. Question
4 points
Which of the following is a redox reaction ?

(1) CaCO₃ → CaO + CO₂

(2) H₂ + Cl₂ → 2HCl

(3) CaO + 2HCl → CaCl₂ + H₂O

(4) NaOH + HCl → NaCl + H₂O
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 6 of 20

6. Question
4 points
Which of the following statements is incorrect ?
- In oxidation, oxygen is added to a substance.
- In reduction, hydrogen is added to a substance.
- Oxidizing agent is oxidized.
- Reducing agent is oxidized.
Correct

Incorrect
Question 7 of 20

7. Question
4 points
Which of the statements about the following reactions is correct ?

ZnO + CO → Zn + CO₂

(1) ZnO is being oxidized.

(2) CO is being reduced.

(3) CO₂ is being oxidized.

(4) ZnO is being reduced
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 8 of 20

8. Question
4 points
A substance which oxidises itself and reduces other is known as
- Oxidising agent
- Reducing agent
- Both of these
- None of these
Correct

Incorrect
Question 9 of 20

9. Question
4 points
In the reaction PbO + C → Pb + CO
- PbO is oxidised.
- C acts as oxidising agent.
- C acts as reducing agent.
- This reaction does not represent redox reaction.
Correct

Incorrect
Question 10 of 20

10. Question
4 points
The following reaction coordinate diagram represents
- an exothermic reaction.
- an endothermic reaction
- a reaction that is neither endothermic nor exothermic.
- a reaction in which a catalyst is used
Correct

Incorrect
Question 11 of 20

11. Question
4 points
The process of oxidation involves
- the absorption of hydrogen atoms.
- the absorption of electrons.
- the release of electrons.
- neither absorption nor release of electrons.
Correct

Incorrect
Question 12 of 20

12. Question
4 points
Rusting of an iron is an example of
- Reduction
- lonization
- Oxidation
- Dissociation
Correct

Incorrect
Question 13 of 20

13. Question
4 points
In the reaction 2MnO₂ + 4Al → 3Mn + 2Al₂O₃ the oxidising agent Is

(1) MnO₂ (2) Al

(3) Al₂O₃ (4) Mn
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 14 of 20

14. Question
4 points
Which of the following does not corrode when exposed to the atmosphere ?
- Iron
- Copper
- Gold
- Silver
Correct

Incorrect
Question 15 of 20

15. Question
4 points
The oxidizing agent in the lead storage battery is

(1) Pb (2) PbO₂

(3) PbSO₄ (4) H₂SO₄
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 16 of 20

16. Question
4 points
When carbon dioxide gas is passed through lime water,
- Calcium hydroxide is formed.
- White precipitate of CaO is formed.
- White precipitate of CaCO3 is formed.
- Colour of lime water disappears.
Correct

Incorrect
Question 17 of 20

17. Question
4 points
In the equation, NaOH + HNO₃ → NaNO₃ + H₂O nitric acid is acting as
- an oxidising agent
- an acid
- a reducing agent
- a dehydrating agent
Correct

Incorrect
Question 18 of 20

18. Question
4 points
Zn²⁺(aq) + 2e^– → Zn(s). This is
- Oxidation
- Reduction
- Redox reaction
- None of these
Correct

Incorrect
Question 19 of 20

19. Question
4 points
Consider the reaction

Zn + Cu²⁺→ Zn²⁺ + Cu

With reference to the above, which one of the following is the correct statement ?

          (1) Zn is reduced to Zn²⁺

          (2) Zn is oxidised to Zn²⁺

          (3) Zn²⁺ is oxidised to Zn.

          (4) Cu²⁺is oxidised to cu.
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 20 of 20

20. Question
4 points
In the reaction PCl₃ + Cl₂→ PCl₅

          (1) PCl₃ is acting as reductant.

          (2) Cl₂ is acting as reductant.

          (3) Both PCl₃ and Cl₂ are acting as reductant.

          (4) Both PCl₃ and Cl₂ are acting as oxidant.
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect

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Quiz 3 : Chemical Reaction and Equations

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Question 1 of 25

1. Question
4 points
When copper powder is heated, it gets coated with
- Black copper oxide
- Yellow copper oxide
- Red copper oxide
- None of these
Correct

Incorrect
Question 2 of 25

2. Question
4 points
Which of the following equations is representing combination of two compounds ?

(1) CaO + CO₂ → CaCO₃

(2) CO + $\frac { 1 }{ 2 }$ O₂ → CO₂

(3) SO₂ + $\frac { 1 }{ 2 }$ O₂ → SO₃

(4) 2Na + 2H₂O → 2NaOH + H₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 3 of 25

3. Question
4 points
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved ?

(i) Displacement reaction

(ii) Precipifation reaction

(iii) Combination reaction

(iv) Double displacement reaction
- (i) only
- (ii) only
- (iv) only
- (ii) and (iv)
Correct

Incorrect
Question 4 of 25

4. Question
4 points
Which of the following is not a thermal decomposition reaction ?

(1) 2H₂O → 2H₂ + O₂

(2) 2FeSO₄ → Fe₂O₃ + SO₂+ SO₃

(3) ZnCO₃ → ZnO + CO₂

(4) 2KClO₃ → 2KCl + 3O₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 5 of 25

5. Question
4 points
Which of the statements about the reaction below are incorrect ?

2PbO(s) + C(s) → 2Pb(s) + CO₂(g)

(i) Lead is getting reduced.

(ii) Carbon dioxide is getting oxidised.

(iii) Carbon is getting oxidised.

(iv) Lead oxide is getting reduced.
- (i) and (ii)
- (i) and (iii)
- (i), (ii) and (iii)
- All of the above
Correct

Incorrect
Question 6 of 25

6. Question
4 points
What happens when dilute hydrochloric acid is added to iron fillings ? Tick the correct answer.
- Hydrogen gas and iron chloride are produced.
- Chlorine gas and iron hydroxide are produced.
- No reaction takes place.
- Iron salt and water are produced.
Correct

Incorrect
Question 7 of 25

7. Question
4 points
The reaction, Fe₂O₃(s) + 2Al(s) → Al₂O₃+ 2Fe(l) is an example of
- Combination reaction
- Double displacement
- Decomposition reaction
- Single displacement reaction
Correct

Incorrect
Question 8 of 25

8. Question
4 points
Which of the following is a displacement reaction ?

          (1) CaCO₃→ CaO + CO₂

          (2) CaO + 2HCl → CaCl₂ + H₂O

          (3) Fe + CuSO₄ → FeSO₄ + Cu

          (4) NaOH + HCl → NaCl + H₂O
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 9 of 25

9. Question
4 points
Which of the following stands for a double displacement reaction ?

          (1) 2H₂ + O₂→ 2H₂O

          (2) 2Mg + O₂ → 2MgO

          (3) AgNO₃ + NaCl → AgCl ↓ + NaNO₃

          (4) H₂ + Cl₂ → 2HCl
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 10 of 25

10. Question
4 points
What amount of CO₂ is evolved when 50g of CaCO₃ is strongly heated ?
- 0.25 mol
- 0.35 mol
- 0.45 mol
- 0.5 mol
Correct

Incorrect
Question 11 of 25

11. Question
4 points
What happens when copper rod is dipped in iron sulphate solution ?
- Copper displaces iron.
- Blue colour of copper sulphate solution is obtained.
- No reaction takes place.
- Reaction is exothermic.
Correct

Incorrect
Question 12 of 25

12. Question
4 points
A student added dilute HCl to a test tube containing zinc qranules and made following observations:

I. The zinc surface became dull and black.

II. A gas evolved which burnt with a pop sound.

III. The Solution remained colourless.

Correct observations are
- I and II
- I and III
- II and III
- I, II and III
Correct

Incorrect
Question 13 of 25

13. Question
4 points
A dilute solution of sodium carbonate was added to two test tubes-one containing dil HCl (A) and the other containing dilute NaOH (B). The correct observation was
- A brown coloured gas liberated in test tube A.
- A brown coloured gas liberated in test tube B.
- A colourless gas liberated in test tube A.
- A colourless gas liberated in test tube B.
Correct

Incorrect
Question 14 of 25

14. Question
4 points
AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)

Above reaction is
- Precipitation reaction
- Double displacement reaction
- Combination reaction
- Both (1) and (2)
Correct

Incorrect
Question 15 of 25

15. Question
4 points
Zn + (dil.) H₂SO₄ → ZnSO₄ + H₂↑

Above reaction is
- Decomposition reaction.
- Single displacement reaction.
- Oxidation reaction.
- Neutralisation reaction.
Correct

Incorrect
Question 16 of 25

16. Question
4 points
The correct formula of rust is

(1) Fe₂O₃ (2) Fe₃O₄

(3) Fe₂O₃.xH₂O (4) Fe₃O₄.xH₂O
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 17 of 25

17. Question
4 points
Antioxidants are
- hydrating agents
- dehydrating agents
- oxidizing agents
- reducing agents
Correct

Incorrect
Question 18 of 25

18. Question
4 points
The rate of a chemical reaction can be increased by adding a
- Catalyst
- Pigment
- Reactant
- Product
Correct

Incorrect
Question 19 of 25

19. Question
4 points
When lead nitrate reacts with potassium iodide yellow precipitate of

(1) Pbl₂ is formed (2) KNO₃ is formed

(3) Pb(NO₃)₂ is formed (4) PblO₃ is formed
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 20 of 25

20. Question
4 points
Among the following metals, which corrodes negligibly ?
- Gold
- Platinum
- Palladium
- All of the above
Correct

Incorrect
Question 21 of 25

21. Question
4 points
Which among the following statements is/are true ? Exposure of silver chloride to sunlight for a long duration turns grey due to

          (i) the formation of silver by decomposition of silver chloride.

          (ii) sublimation of silver chloride.

          (iii) release of chlorine gas form silver chloride.

          (iv) oxidation of silver chloride.
- (i) only
- (i) and (iii)
- (ii) and (iii)
- (iv) only
Correct

Incorrect
Question 22 of 25

22. Question
4 points
What does the symbol (aq) represents in chemical equation ?
- It represents the aquatic state of the matter.
- It states that the reactant or product is in aqueous state.
- It states which is the main reacting substance.
- None of the above.
Correct

Incorrect
Question 23 of 25

23. Question
4 points
The presence of any of the halide icons i.e, chloride, bromide or iodide in a compound can be tested using ________ as a reagent.
- Silver nitrate solution
- Hydrogen sulphide gas
- Sodium hydroxide
- Ammonia solution
Correct

Incorrect
Question 24 of 25

24. Question
4 points
In a chemical equation the symbol ‘↓’ represents
- the rise in temperature
- a fall in temperature
- the evolution of a gas
- the formation of precipitates
Correct

Incorrect
Question 25 of 25

25. Question
4 points
In a chemical equation the symbol ‘↑’ represents
- the rise in temperature
- the evolution of gas
- a fall in temperature
- the formation of precipitates
Correct

Incorrect

Acids Bases and Salts

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Quiz 1 : Acids, Bases and Salts

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Question 1 of 20

1. Question
4 points
Which of the following is a strong acid?
- Lactic acid
- Ascorbic acid
- Sulphuric acid
- Formic acid
Correct

Incorrect
Question 2 of 20

2. Question
4 points
Which of the following is a strong acid?

(1) H₂CO₃ (2) CH₃COOH

(3) HCl (4) HCOOH
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 3 of 20

3. Question
4 points
Which of the following is a dibasic acid?

(1) HCl (2) H₃PO₄

(3) HNO₃ (4) H₂SO₄
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 4 of 20

4. Question
4 points
Acetic acid is a weak acid because
- its aqueous solution is acidic
- it is highly ionized
- it is weakly ionized
- it contains –COOH group
Correct

Incorrect
Question 5 of 20

5. Question
4 points
The incorrect statement about acids is
- they give H+ ion in water
- they are sour in taste
- they turn blue litmus red
- they give pink colour with phenolphthalein
Correct

Incorrect
Question 6 of 20

6. Question
4 points
Choose an example of inorganic acid (mineral acid) from the following
- Oxalic acid
- Acetic acid
- Nitric acid
- Formic acid
Correct

Incorrect
Question 7 of 20

7. Question
4 points
Slaked lime is prepared by adding water to
- bleaching powder
- lime water
- milk of lime
- quicklime
Correct

Incorrect
Question 8 of 20

8. Question
4 points
Which of the following is not basic in nature?
- KOH
- ZnO
- Al(OH)3
- NaCl
Correct

Incorrect
Question 9 of 20

9. Question
4 points
Which of the following is not basic in nature?

(1) KOH (2) Ca(OH)₂

(3) K₂SO₄ (4) ZnO
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 10 of 20

10. Question
4 points
Mark the correct statement.

          (1) Both bases and alkalies are soluble in water.

          (2) Alkalies are soluble in water but all bases are not.

          (3) C₂H₅OH is a base because it has OH group.

          (4) Bases are soluble in water but alkalies are not.
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 11 of 20

11. Question
4 points
Acidity of ammonium hydroxide is
- 1
- 2
- 3
- 4
Correct

Incorrect
Question 12 of 20

12. Question
4 points
Which of the following is the weakest base?

(1) NaOH (2) Ca(OH)₂

(3) NH₄OH (4) KOH
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 13 of 20

13. Question
4 points
Which one of the following will turn red litmus blue?
- Vinegar
- Baking soda solution
- Lemon juice
- Soft drinks
Correct

Incorrect
Question 14 of 20

14. Question
4 points
Which of the following statement is true regarding acids and bases?
- Acid and bases don’t react with each other
- Acids mixed with bases neutralise each other
- Acids mixed with bases make stronger acids
- Acids mixed with bases make stronger bases
Correct

Incorrect
Question 15 of 20

15. Question
4 points
A blue litmus paper was first dipped in dil. HCl and then in dil. NaOH solution. It was observed that the colour of the litmus paper
- Changed to red
- Changed first to red and then to blue
- Changed blue to colourless
- Remained blue in both the solutions
Correct

Incorrect
Question 16 of 20

16. Question
4 points
Phenolphthalein is
- Yellow in acidic medium, pink in basic medium
- Pink in acidic medium, colourless in basic medium
- Colourless in acidic medium, pink in basis medium
- Pink in acidic medium, yellow in basic medium
Correct

Incorrect
Question 17 of 20

17. Question
4 points
When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observations made is that
- the surface of the metal turns shining
- the reaction mixture turns milky
- odour of chlorine is observed
- a colourless and odourless gas is evolved with bubbles
Correct

Incorrect
Question 18 of 20

18. Question
4 points
The reaction of metal with acid results in the formation of
- only hydrogen gas
- only salt
- both salt and hydrogen gas
- None of these
Correct

Incorrect
Question 19 of 20

19. Question
4 points
When zinc reacts with sodium hydroxide, the products formed are
- zinc hydroxide and sodium
- sodium zincate and water
- sodium zincate and hydrogen gas
- sodium zincate and oxygen
Correct

Incorrect
Question 20 of 20

20. Question
4 points
Which of the following metals can displace hydrogen from the aqueous solution of sodium hydroxide?
- Mg
- Cu
- Al
- Ag
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Question 1 of 20

1. Question
4 points
Which gas is evolved when acids react with metal carbonates?

(1) CO₂ (2) H₂ (3) NH₃ (4) O₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 2 of 20

2. Question
4 points
Acetic acid was added to a solid x kept in a test tube. A colourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that

(1) solid X is sodium hydroxide and the gas evolved is CO₂

(2) solid X is sodium bicarbonate and the gas evolved is CO₂

(3) solid X is sodium acetate and the gas evolved is CO₂

(4) solid X is sodium chloride and the gas evolved is CO₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 3 of 20

3. Question
4 points
When CO₂ is passed through lime water, it turns milky. The milkiness is due to formation of

(1) CaCO₃ (2) Ca(OH)₂

(3) H₂O (4) CO₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 4 of 20

4. Question
4 points
A solution reacts with crushed egg-shells to give a gas that turns lime water milky. The solution contains
- NaCl
- HCl
- LiCl
- KCl
Correct

Incorrect
Question 5 of 20

5. Question
4 points
CuO + (X) → CuSO₄ + H₂O. Here (X) is

(1) CuSO₄ (2) HCl

(3) H₂SO₄ (4) HNO₃
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 6 of 20

6. Question
4 points
When an oxide of a non-metal reacts with water which of the following is formed?
- Acid
- Base
- Salt
- None of these
Correct

Incorrect
Question 7 of 20

7. Question
4 points
Which of the following is ‘quicklime’?

(1) CaO (2) Ca(OH)₂

(3) CaCO₃ (4) CaCl₂.6H₂O
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 8 of 20

8. Question
4 points
Which acids are highly corrosive in nature?
- Acetic acid and oxalic acid
- Acetic acid and sulphuric acid
- Sulphuric acid and nitric acid
- Carbonic acid and acetic acid
Correct

Incorrect
Question 9 of 20

9. Question
4 points
Which of the following does not give H⁺ ions in aqueous solution?

(1) H₂CO₃ (2) C₂H₅OH

(3) CH₃COOH (4) H₃PO₄
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 10 of 20

10. Question
4 points
Which one of the following is a strong electrolyte?
- Carbon disulphide
- Ammonium hydroxide
- Sodium chloride
- Water
Correct

Incorrect
Question 11 of 20

11. Question
4 points
When sodium chloride reacts with sulphuric acid, a gas is evolved which gives dense white fumes with ammonia. Which gas is evolved?

(1) HCl (2) NH₄Cl

(3) NH₄OH (4) (NH₄)₂SO₄
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 12 of 20

12. Question
4 points
For dilution of concentrated acid we should add
- water into concentrated acid
- concentrated acid into water
- first water into acid and then more acid
- Both (1) and (2) are correct
Correct

Incorrect
Question 13 of 20

13. Question
4 points
A solution turns blue litmus red. The pH of the solution is probably
- 8
- 10
- 12
- 6
Correct

Incorrect
Question 14 of 20

14. Question
4 points
When bitten by an ant, the sting causes irritation due to the presence of
- a base in the sting
- formic acid in the sting
- poisonous chemicals
- Both (1) and (2)
Correct

Incorrect
Question 15 of 20

15. Question
4 points
Which of the following is incorrectly matched?
- Tomato – Oxalic acid
- Ant sting – citric acid
- Citric fruit – citric acid
- Curd – lactic acid
Correct

Incorrect
Question 16 of 20

16. Question
4 points
Two solution A and B were found to have pH value of 6 And 8 respectively. The inference which can be drawn is that
- the acid strength of the solution B is higher than that of A
- A is an acid while B is a base
- Both are acidic solutions
- Both are basic solutions
Correct

Incorrect
Question 17 of 20

17. Question
4 points
pH + pOH equals
- Zero
- fourteen
- a negative number
- infinity
Correct

Incorrect
Question 18 of 20

18. Question
4 points
The acid used in making of vinegar is
- formic acid
- acetic acid
- sulphuric acid
- nitric acid
Correct

Incorrect
Question 19 of 20

19. Question
4 points
Antacids contain
- weak base
- weak acid
- strong base
- strong acid
Correct

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Question 20 of 20

20. Question
4 points
The question between an acid and a base is

XOH + HY → XY + H₂O

Which of the following is the cation part of salt?
- X
- OH
- H
- Y
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Quiz 1 : Metal and Non-Metals

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Question 1 of 20

1. Question
4 points
An alloy of zinc and copper is dissolved in dilute hydrochloric acid. Hydrogen gas is evolved. In this evolution of gas
- Only zinc reacts with dilute hydrochloric acid
- Only copper reacts with dilute hydrochloric acid
- both zinc and copper reacts with dilute hydrochloric acid
- Only copper reacts with water
Correct

Incorrect
Question 2 of 20

2. Question
4 points
Cu + HCl →
- react vigorously
- no reaction
- react moderately
- react slowly
Correct

Incorrect
Question 3 of 20

3. Question
4 points
Copper sulphate solution can be safely kept in a container made of
- Aluminium
- Lead
- Silver
- Zinc
Correct

Incorrect
Question 4 of 20

4. Question
4 points
Breakers A, B and C contain zinc sulphate, silver sulphate, and iron (II) sulphate solutions respectively. Copper pieces are added to each breaker. Blue colour will appear in case of
- breaker A
- breaker B
- breaker C
- All the breakers
Correct

Incorrect
Question 5 of 20

5. Question
4 points
Which of the following reactions cannot occur ?

(1) 2AgNO₃(aq) + Fe(s) → Fe(NO₃)₂(aq) +2Ag(s)

(2) CuSO₄(aq) + Zn(s) → ZnSO₄(aq) + Cu(s)

(3) CuSO₄(aq) + 2Ag(s) →Cu(s) + Ag₂SO₄(aq)

(4) 2AgNO₃(aq) + Zn(s) → Zn(NO₃)₂(aq) + 2Ag(s)
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 6 of 20

6. Question
4 points
A student puts one big iron nail each in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish-brown coating was observed only on the surface of iron nail which was put in the solution of
- Zinc sulphate
- Iron sulphate
- Copper sulphate
- Aluminium sulphate
Correct

Incorrect
Question 7 of 20

7. Question
4 points
The reaction Cu²⁺(aq) + Zn(s) → Zn²⁺(aq) + Cu(s) indicates that the metal which appears lower in the reactively series is

(1) Zn (2) Cu (3) Zn²⁺(4) Cu²⁺
- (1)
- (2)
- (3)
- (4)
Correct

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Question 8 of 20

8. Question
4 points
Identify the pair of metals which reacts with conc. HNO₃ to liberate hydrogen gas ?
- Cu, Zn
- Cu, Mg
- Mg, Mn
- Zn, Mn
Correct

Incorrect
Question 9 of 20

9. Question
4 points
Which of the following pairs will give displacement reactions ?

(1) ZnSO₄ solution and Aluminium metal

(2) MgCl₂ solution and Aluminium metal

(3) FeSO₄solution and Silver metal

(4) NaNO₃ solution and copper metal
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 10 of 20

10. Question
4 points
Non metals generally contain………. electrons in their outer most shell
- 1, 2 or 3
- 5, 6, 7 and 8
- 10 and 18
- 8, 9 and 10
Correct

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Question 11 of 20

11. Question
4 points
Metal always found in free state is
- Gold
- Silver
- Copper
- Sodium
Correct

Incorrect
Question 12 of 20

12. Question
4 points
Cinnabar is an ore of
- Hg
- Cu
- Pb
- Zn
Correct

Incorrect
Question 13 of 20

13. Question
4 points
Which of the following is an oxide ore ?
- Bauxite
- Cuprite
- Haematite
- All of these
Correct

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Question 14 of 20

14. Question
4 points
All ores are minerals while all minerals are not ores because
- the metal cannot be extracted economically from all the minerals
- Minerals are complex compounds
- Minerals are obtained from mines
- All of these are correct
Correct

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Question 15 of 20

15. Question
4 points
The impurities present in an ore are known by the name
- Flux
- Ore
- Gangue
- Slag
Correct

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Question 16 of 20

16. Question
4 points
Which of the following ores is best concentrated by froth floatation method?
- Galena
- Cassiterite
- Magnetite
- Malachite
Correct

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Question 17 of 20

17. Question
4 points
Which one of the following is not a method of concentration of metal ores?
- Gravity separation
- Froth floatation process
- Electromagnetic separation
- Smelting
Correct

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Question 18 of 20

18. Question
4 points
Which one of the following ore is not concentrated by froth floatation process?
- Copper pyrites
- Copper glance
- Rock salt
- Zinc blende
Correct

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Question 19 of 20

19. Question
4 points
The process of removing lighter gangue particles by washing in a current of water is called
- levigation
- liquation
- leaching
- cupellation
Correct

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Question 20 of 20

20. Question
4 points
Gravity separation method is based upon
- preferential washing of ores and gangue particles
- difference in densities of ore particles and impurities
- difference in chemical property of ore particles and impurities
- none of these
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Quiz 1 : Carbon & Its Compounds

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Question 1 of 20

1. Question
4 points
Which of the following is not a saturated hydrocarbon?
- Cyclohexane
- Benzene
- Butane
- Isobutane
Correct

Incorrect
Question 2 of 20

2. Question
4 points
Which of the following is a pair of saturated hydrocarbon?
- Butane and isobutane
- Cyclohexane and hexane
- Propanal and propanone
- All of these
Correct

Incorrect
Question 3 of 20

3. Question
4 points
A double bond between two carbon atoms is formed by
- Transfer of two electrons from one carbon to the other
- Transfer one electron from one carbon to the other
- Sharing of two electrons
- Sharing of two pairs of electrons
Correct

Incorrect
Question 4 of 20

4. Question
4 points
Which of the following is an isomeric pair?
- Ethane and propane
- Ethane and ethene
- Propane and butane
- Butane and 2-methyl propane
Correct

Incorrect
Question 5 of 20

5. Question
4 points
Pentane has the molecular formula C₅H₁₂. It has
- 5 covalent bonds
- 12 covalent bonds
- 16 covalent bonds
- 17 covalent bonds
Correct

Incorrect
Question 6 of 20

6. Question
4 points
Which of the following gases is called ‘Marsh gas’?

(1) H₂ (2) CH₄

(3) C₂H₄ (4) C₂H₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 7 of 20

7. Question
4 points
Organic compounds will always contains
- Carbon
- Hydrogen
- Nitrogen
- Sulphur
Correct

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Question 8 of 20

8. Question
4 points
Which of the following statement is not correct ?
- A common functional group is present in different members of a Homologous series.
- Two consecutive members of a homologous series differ by a –CH3 group
- The members of a homologous series can be represented by one general formula.
- Different members of a homologous series have similar chemical properties.
Correct

Incorrect
Question 9 of 20

9. Question
4 points
The difference in molecular weight of two consecutive members of a homologous series is
- 15
- 14
- 8
- 9
Correct

Incorrect
Question 10 of 20

10. Question
4 points
Which of the following belong to the same homologous series?
- Ethane, ethane, ethyne
- Propanal, propanone, propanal
- Methanol, ethanol, propanol
- Ethane, ethanol, ethanoic acid
Correct

Incorrect
Question 11 of 20

11. Question
4 points
Unsaturation in the organic compound can be tested by the help of
- Baeyer’s test
- Fehling’s test
- Chlorination reaction
- Dehydration reaction
Correct

Incorrect
Question 12 of 20

12. Question
4 points
The functional group present in butanone is
- Carboxy
- Ketonic
- Aldehydic
- Alcoholic
Correct

Incorrect
Question 13 of 20

13. Question
4 points
The IUPAC name of CH₃CHO is
- Acetaldehyde
- Methanal
- Ethanal
- Formaldehyde
Correct

Incorrect
Question 14 of 20

14. Question
4 points
The IUPAC name of is
- 2, 2, 3-Trimethypentane
- 3, 4, 4-Trimethypentane
- 2-Ethyl-3, 3-dimethylbutane
- 2, 3-Dimethlhexane
Correct

Incorrect
Question 15 of 20

15. Question
4 points
The IUPAC name of compound CH₂ = C(CH₃)₂ is
- 1, 1-Dimethylprop-2-ene
- 2-Methylprop-1-ene
- 2-Etyhl-3, 3-dimethylbutane
- 2, 3-Dimethylhexane
Correct

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Question 16 of 20

16. Question
4 points
The second member of homologous series of alkenes is
- Ethene
- Propene
- Butane
- Ethyne
Correct

Incorrect
Question 17 of 20

17. Question
4 points
Compound has the IUPAC name
- 3-Methylpentanoyl chloride
- 1-Chloroformyl-2-methyl butane
- 3-Methylchloridebutane
- 3-Methylchloropentanone
Correct

Incorrect
Question 18 of 20

18. Question
4 points
Methane, ethane and propane are said to form a homologous series because all are
- hydrocarbons
- saturated hydrocarbons
- aliphatic hydrocarbons
- differ from each other by –CH2 group
Correct

Incorrect
Question 19 of 20

19. Question
4 points
The reactions CH₄+ Cl₂ $\xrightarrow [ \quad hv\quad ]{ \quad light\quad }$ is an example of
- addition reaction
- substitution reaction
- elimination reaction
- oxidation reaction
Correct

Incorrect
Question 20 of 20

20. Question
4 points
The final product obtained when methane reacts with chlorine in presence of sunlight is

(1) C₂Cl₆ (2) CCl₄

(3) CHCl₃ (4) CH₂Cl₂
- (1)
- (2)
- (3)
- (4)
Correct

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Quiz 1 : Periodic Classification of Elements

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Question 1 of 20

1. Question
4 points
Which of the following pair of atomic numbers represents s-block elements ?
- 7, 15
- 6, 12
- 9, 17
- 3, 20
Correct

Incorrect
Question 2 of 20

2. Question
4 points
In the periodic table, the element with atomic number 16 will be placed in the group
- Fourteen
- Sixteen
- Thirteen
- Fifteen
Correct

Incorrect
Question 3 of 20

3. Question
4 points
Which of the following statements is not a correct statement about the trends when going from left to right across the periodic table ?
- The elements become less metallic in nature
- The number of valence electrons increases
- The atoms lose their electrons more easily
- The oxides become more acidic
- The oxides become more acidic
Correct

Incorrect
Question 4 of 20

4. Question
4 points
Which of the following remains unchanged on going down the group in the periodic table ?
- Density
- Valence electrons
- Atomic size
- Metallic character
Correct

Incorrect
Question 5 of 20

5. Question
4 points
Which statement is wrong about C and Si ?
- They have similar chemical properties
- They have same electronic configuration
- They form double bonds
- None of these
Correct

Incorrect
Question 6 of 20

6. Question
4 points
Element X forms a chloride with formula XCl₄ which is a solid with low melting point. X would most likely be in the same group of the periodic table is
- Na
- Mg
- Al
- Si
Correct

Incorrect
Question 7 of 20

7. Question
4 points
If an element belongs to group 13 and the second period of the periodic table, which of the following sets of properties would it exhibit ?
- Liquid, most metallic
- Gaseous, moderately metallic
- Solid, non-metallic
- Solid, less metallic
Correct

Incorrect
Question 8 of 20

8. Question
4 points
Which of the following increases along the period ?
- Number of valence electrons
- Atomic size
- Electropositive character
- All of these
Correct

Incorrect
Question 9 of 20

9. Question
4 points
Which of the following elements has three valence electrons ?
- Cs
- Ca
- Al
- S
Correct

Incorrect
Question 10 of 20

10. Question
4 points
Each of the following element forms univalent ions except
- Li
- Na
- Mg
- K
Correct

Incorrect
Question 11 of 20

11. Question
4 points
Which of the following pairs are chemically dissimilar ?
- Na, K
- Ba, Sr
- C, Si
- Ca, Cs
Correct

Incorrect
Question 12 of 20

12. Question
4 points
The valency of noble gases, in general is
- zero
- one
- two
- eight
Correct

Incorrect
Question 13 of 20

13. Question
4 points
An element M has an atomic number 9 and atomic mass 17. Its ions will be represented by

(1) M (2) M⁺²

(3) M^– (4) M^-2
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 14 of 20

14. Question
4 points
Which element has the largest size in the second period ?
- N
- F
- Li
- Be
Correct

Incorrect
Question 15 of 20

15. Question
4 points
Which has the maximum atomic radius ?
- Al
- Si
- P
- Mg
Correct

Incorrect
Question 16 of 20

16. Question
4 points
In the third period of the periodic table, the element having smallest size is
- Na
- Ar
- Cl
- Si
Correct

Incorrect
Question 17 of 20

17. Question
4 points
Among O, C, F, Cl, Br the correct order of increasing atomic radii is
- F, O, C, Cl, Br
- F, C, O, Cl, Br
- F, Cl, Br, O, C
- C, O, F, Cl, Br
Correct

Incorrect
Question 18 of 20

18. Question
4 points
Alkali metal in each period have
- Smallest size
- Lowest I.E.
- Highest E.A.
- Highest electronegativity
Correct

Incorrect
Question 19 of 20

19. Question
4 points
From top to bottom in a group of the periodic table the electropositive character of the elements
- increases
- decreases
- remains unchanged
- changes irregularly
Correct

Incorrect
Question 20 of 20

20. Question
4 points
Elements of which group form anions most readily
- oxygen family
- nitrogen group
- halogens
- alkali metals
Correct

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Question 1 of 20

1. Question
4 points
Arrange S, O and Se in ascending order of electron affinity ?
- Se < S < O
- Se < O < S
- S < O < Se
- S < Se < O
Correct

Incorrect
Question 2 of 20

2. Question
4 points
Which pair of elements of the following sets is likely to have similar chemical behaviour ?
- Sodium and aluminium
- Argon and potassium
- Boron and germanium
- Nitrogen and phosphorous
Correct

Incorrect
Question 3 of 20

3. Question
4 points
Considering the elements B, Al, Mg, and K, the correct order of their metallic character is
- B > Al > Mg > K
- Al > Mg > B > K
- Mg > Al > K > B
- K > Mg > Al >B
Correct

Incorrect
Question 4 of 20

4. Question
4 points
In the periodic table, the metallic character of elements
- decreases from left to right and down the group
- decreases from left to right and increases down the group
- increases from left to right and down the group
- increases from left to right and decreases down the group
Correct

Incorrect
Question 5 of 20

5. Question
4 points
Gradual addition of electronic shells in the noble gases causes a decrease in their
- Ionisation energy
- Atomic radius
- Boiling point
- Density
Correct

Incorrect
Question 6 of 20

6. Question
4 points
Which of the following elements has the least nonmetallic character
- Fluorine
- Chlorine
- Bromine
- Iodine
Correct

Incorrect
Question 7 of 20

7. Question
4 points
Why are the elements lithium, sodium and potassium called alkali metals ?
- Because they reacts with water to form alkali
- Because they form acidic oxides
- Because they are present in first group
- Because they are less reactive in nature
Correct

Incorrect
Question 8 of 20

8. Question
4 points
Which of the following oxides is amphoteric in nature ?

(1) CaO (2) CO₂ (3) SiO₂ (4) SnO₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 9 of 20

9. Question
4 points
Which of the following hydroxides is most basic ?

(1) Be(OH)₂ (2) Ba(OH)₂

(3) Ca(OH)₂ (4) Mg(OH)₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 10 of 20

10. Question
4 points
Which of the following elements will form acidic oxide ?
- Sodium
- Magnesium
- Aluminium
- Sulphur
Correct

Incorrect
Question 11 of 20

11. Question
4 points
Which of the following substances has the least ionic character ?

(1) FeCl₂ (2) ZnCl₂

(3) CaCl₂ (4) MgCl₂
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 12 of 20

12. Question
4 points
The correct order of the thermal stability of hydrogen halides (H-X) is
- HI > HBr >HCl > HF
- HF > HCl > HBr > HI
- HCl < HF > HBr < HI
- HI > HCl > HF > HBr
Correct

Incorrect
Question 13 of 20

13. Question
4 points
Which of the following aqueous acid is most acidic ?
- HCl
- HF
- HI
- HBr
Correct

Incorrect
Question 14 of 20

14. Question
4 points
Which of the following is the strongest acid ?

(1) HClO (2) HClO₂

(3) HClO₃ (4) HClO₄
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect
Question 15 of 20

15. Question
4 points
The decreasing order of the ionization potential of the following elements is
- Ne > Cl > P > S > Al > Mg
- Ne > Cl > P > S > Mg > Al
- Ne > Cl > S > P > Mg > Al
- Ne > Cl > S > P > Al > Mg
Correct

Incorrect
Question 16 of 20

16. Question
4 points
The set representing the correct order of first ionization potential is
- K > Na > Li
- Be > Mg > Ca
- B > C > N
- Ge > Si > C
Correct

Incorrect
Question 17 of 20

17. Question
4 points
Ionization energy of nitrogen is more than oxygen due to
- Increased attraction of electron towards nucleus
- Extra stability of half filled ‘p’ orbital
- Small size of N2
- None of these
Correct

Incorrect
Question 18 of 20

18. Question
4 points
The correct order of first ionization enthalpy of B, C, O & N is
- B < C < N < O
- B < C < O < N
- O < N < B < C
- N < O < C < B
Correct

Incorrect
Question 19 of 20

19. Question
4 points
The increasing order of the first ionization enthalpies of the elements B,P,S and F (lowest first) is
- B < P < S < F
- B < S < P < F
- F < S < P < B
- P < S < B < F
Correct

Incorrect
Question 20 of 20

20. Question
4 points
Which of the following conjugate base has maximum charge density ?

(1) O^-2 (2) S^-2 (3) Te^-2 (4) Se^-2
- (1)
- (2)
- (3)
- (4)
Correct

Incorrect

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