A 0.1097 gm sample of As₂O₃ require 26.10 ml of KMnO₄ solution for its titration. The molarity of KMnO₄ solution is

1. 0.02

2. 0.04

3. 0.018

4. 0.3

A sample of CaCO₃ is 50% pure. On heating 1.12 litres of CO₂ (at STP) is obtained. The weight of residues left (assuming non-volatile impurity) is:

(Ca = 40, C= 12, O=16)

Consider the given reaction, 2SO₂ + O₂ $\to$2SO₃ 

6.4 g SO₂ and 3.2 g O₂ to form SO₃ . The mass of SO₃ formed is:  

1. 32 g
2. 16 g
3. 8 g
4. 4 g

The molality of a 20% (by mass) CaCO₃ solution is : 
(Given: Density of solution is 1.2 gm/ml)

1 gm butane (C₄H₁₀) is burnt with excess of O₂ to form CO₂. The approximate mass of CO₂ produced is

1. 1gm

2. 2gm

3. 3gm

4. 4gm

If 0.5 moles of BaCl₂ is reacted with 0.2 moles of Na₃PO₄ then the maximum moles of Ba₃(PO₄)₂ formed is:

2 gm Iron pyrite (FeS₂) is burnt with O₂ to form Fe₂O₃ and SO₂. The mass of SO₂ produced is (Fe=56, S=32, O=16)

1. 2 gm

2. 2.13 gm

3. 4 gm

4. 4.26 gm

Rearrange the following (I to IV) in the order of increasing masses and choose answer from (1), (2), (3) and (4) (Atomic mass : N=14, O=16 Cu = 63)

I. 1 molecule of oxygen

II. 1 atom of nitrogen

III. 1 x 10^-10g molecule-weight of oxygen

IV. 1 x 10^-10g atom-weight of copper

1. II < I < III < IV

2. IV < III < II < I

3. II < III < I < IV

4. III < IV < I < II

What is the ratio of the number of atoms in 2.2 g of CO₂ and in 1.7 g of NH₃?

How many moles of FeC₂O₄ are required to reduce one mole of KMnO₄ in acidic medium?

1. 3/5

2. 1/5

3. 5/3

4. 5