The hydrolysis product of PCl₃ and NCl₃ are respectively

(a) H₃PO₃, NH₃         (b) PH₃, NH₄OH        (c) H₃PO₄, NH₃        (d) PH₃, NH₃

Na₂CO₃ can be manufactured by Solvay’s process, but K₂CO₃ cannot be prepared because:

(a) K₂CO₃ is more soluble                                         

(b) Na₂CO₃ is less soluble         

(c) KHCO₃ is more soluble than NaHCO₃                     

(d) KHCO₃ is less soluble than NaHCO₃

When hydrated MgCl₂. 6H₂O is strongly heated

(a) MgO is formed                            (b) Mg(OH)₂ is formed  

(c) Mg(OH)Cl is formed                    (d) Anhydrous MgCl₂ is formed

Which of the following has the lowest boiling point ?

In the clathrates of xenon with water, the nature of bonding between xenon and water molecule is:

Water solubility will be minimum for

(a) BaSO₄             (b) MgSO₄              (c) SrSO₄             (d) CaSO₄

(NH₄)₂Cr₂O₇ on heating gives

(a) Cr₂O₃ and NH₃           (b) Cr₂O₃ and N₂

(c) H₂CrO₄ and N₂           (d) H₂CrO₄ and NH₃

NO can be produced by the

(a) Thermal decomposition of NH₄NO_3­

(b) Thermal decomposition of NH₄NO₂

(c) Disproportionation of N₂O₄

(d) Reaction of NH₄OH with HNO₂

Water reacts with potassium to give

(a) KOH + O₂                 (b) KOH + H₂

(c) K₂O + H₂                   (d) KOH + O₃

In which of the following pairs does the 1^st gas bleach by reduction while the 2^nd gas does so by oxidation?

(a) CO and Cl₂               (b) SO₂ and Cl₂

(c) Cl₂ and SO₂              (d) NH₃ and SO₂

Boron shows diagonal relationship with

Which one of the following nitrates will produce laughing gas on heating ?          

(a) NaNO₃                      (b) Ca(NO₃)₂

(c) Hg(NO₃)₂                  (d) NH­₄NO₃

Which of the following acid contains O – O bond

a) H₂S₂O₃              b) H₂S₂O₈                 c) H₂S₂O₄                d) H₂S₄O₆

Choose the correct options: –

(a) H₃PO₄ is both reducing and tribasic

(b) H₃PO₃ is both reducing and dibasic

(c) H₃PO₃ is not reducing but dibasic

(d) H₃PO₄ is reducing but tribasic

H₃BO₃ is

In diborane

Thermite is mixture of iron oxide and

The type of hybridization of boron in diborane

(A) Sp hybridization                                            (B) Sp² hybridization
(C) Sp³ hybridization                                          (D) Sp³ d² hybridization

In the electrolytic extraction of Aluminium fused cryolite is added. Its role is

During the electrolytic reduction of alumina, the reaction at cathode is

(A) 2H₂O → O₂ + 4H⁺ + 4e^–                            (B) 3F^– → 3F⁺ + 3e^–
(C) Al³⁺ + 3e^– → Al                                           (D) 2H⁺ + 2e^– → H₂

When bauxite powder is mixed with coke and reacted with nitrogen at 2075K, carbon compound and X are formed. What is the gas formed when X is reacted with water

(A) NH₃                                                             (B) N₂
(C) N₂O                                                             (D) O₂

In the reaction, B₂H₆ + 2KOH + 2X → 2Y + 6H₂ X and Y are respectively       

(A) H₂, H₃BO₃                                                     (B) HCl, KBO₂
(C) H₂O, KBO₃                                                   (D) H₂O, KBO₂

X reacts with aqueous NaOH solution to form Y and H₂. Aqueous solution of Y is heated to 323 – 333 K and on passing CO₂ into it, Na₂CO₃ and Z were formed. When Z is heated to 1200^oC, Al₂O₃ is formed. X, Y and Z respectively are                                                                       

(A) Al, AlCl₃, NaAlO₂                                           (B) Zn, Na₂ZnO₂,Al(OH)₃
(C) Al, Al(OH)_3, AlCl₃                                           (D) Al, NaAlO₂, Al(OH)₃

The structure of SiO₂ is

Gas ‘A’ is bubbled through slaked lime when a white precipitate is formed. On prolonged, bubbling the precipitate dissolved. On heating the resulting solution, the white precipitate reappeared with evolution of gas ‘B’. The gases ‘A’ & ‘B’ respectively are                                   

(A) CO₂ & CO                                                    (B) CO & CO₂
(C) CO₂ & CO₂                                                   (D) CO & CO

Carbogen is

(A) pure form of carbon                                     (B) COCl₂
(C) mixture of CO & CO₂                                    (D) mixture of O₂ & CO₂

What is the approximate calorific value (in kcal. M^–3) of water gas ?

Oxalic acid reacts with conc. H₂SO₄ to give a mixture of two gases. When this mixture is passed through caustic potash. One of the gases is absorbed. What is the product formed by the absorbed gas with caustic potash

(A) K₂SO₄                                                          (B) KHCO₃
(C) K₂CO₃                                                          (D) KOH

Which one of the following is correct about stability of the given ions?

(A) Pb⁺² > Pb⁺⁴                                                  (B) Pb⁺⁴ > Pb⁺²
(C) Si⁺⁴ > Si⁺²                                                     (D) Sn⁺⁴ > Sn⁺²

Silica reacts with Mg to form a magnesium compound X, X reacts with dilute HCl to form Y. What is Y?  

(A) MgO                                                            (B) MgCl₂
(C) MgSiO₃                                                        (D) SiCl₄

SiO₂ is reacted with sodium carbonate. What is the gas liberated?          

(A) CO                           (B) O₂                                (C) CO₂                            (D) O₃