A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with Na₂CO₃ to precipitate the calcium as calcium carbonate. This calcium carbonate is heated to convert all the calcium to calcium oxide and the final mass of calcium oxide is 1.62 gm. The percentage by mass of calcium chloride in the original mixture is

A sample of Oleum is labeled 104.5%. The % of free SO₃ in the sample is

125 ml of Na­₂CO₃ solution requires 100 ml of 0.1 N HCl to reach end point with Phenolphthalein as indicator. Molarity of resulting solution with respect to HCO₃^– ion is

The equivalent weight of HCl in the given reaction is

K₂Cr₂O₇ + 14 HCl  →  2 KCl + 2 CrCl₃ + 3 Cl₂ + H₂O

An aqueous solution of 6.3g of oxalic acid dihydrate is made upto 250 ml. The volume of 0.1 N NaOH required to completely neutralize 10 ml of this solution is

How many mole of Fe²⁺ ions are formed, when excess of iron is treated with 50 ml of 4 M HCl under inert atmosphere assuming no change in volume

The molarity of NO₃^– in the solution after 2 litres of 3M AgNO₃ is mixed with 3 litres of 1M BaCl₂ is :

1 litre solution of N/2 HCl is heated in a beaker. It was observed that when the volume of solution reduced to 600 ml, 3.25g of HCl is lost. Calculate the normality of the new solution.

Normality of 10% (weight / volume) acetic acid would be

The solution A and B are 0.1 and 0.2 molar in a substance. If 100 ml of A are mixed with 25 ml of B and there is no change in volume, then the final molarity of the solution is

SO₂Cl₂ + 2H₂O → H₂SO₄ + 2HCl, If 100 gm SO₂­Cl­₂ completely reacts with water then to neutralize this resultant solution how much solid KOH should be added into the solution? [At. Mass of S = 32, K=39]

FeS₂ + O₂ → Fe₂O₃ + SO₂, Equivalent wt. of FeS₂ in this reaction is [at. Wt. of Fe = 56]

20 ml 0.1m KI solution is completely oxidized by 0.03 M barium permanganate solution in acidic medium. The volume of permanganate required is

The simplest molecular formula of a metal oxide containing 23% oxygen would be [Atomic weight of the metal is 80.35]

(a) MO₂              (b) M­₂O                (c) MO              (d) M₂O₃

When ferricyanide reacts with H₂O₂ in alkaline medium then the molar ratio of [Fe(CN)₆]^-3 and H₂O₂ is

How many moles of acidified FeSO₄ can be completely oxidized by one mole of KMnO₄ ?

10 grams of CaCO₃ is completely decomposed to X and CaO. X is passed into an aqueous solution containing one mole of sodium carbonate. What is the number of moles of sodium bicarbonate formed (Mol. wt.: CaCO₃ = 100, Na₂CO₃ = 106, NaHCO₃ = 84)

2 gram of sulphur is completely burnt in oxygen to form SO₂. In this reaction what is the volume of O₂ consumed at STP in litres ?

If 0.5 mol of BaCl₂ is mixed with 0.2 mol of Na₃PO₄, then maximum number of moles of Ba₃(PO₄)₂ that can be formed is

The equivalent mass of MnSO₄ is half of its molecular mass when it is converted to

(A) Mn₂SO₃                                                        (B) MnO₂
(C) MnO₄^–                                                           (D) MnO₄^2–

Assuming full decomposition, the volume of CO₂ released at STP on heating 9.85g of BaCO₃ (At. mass Ba = 137) will be