Which of the following gases would have a mass of 4.4 g for a volume of 2.24 L at NTP?

1.	Carbon dioxide	2.	Carbon monoxide
3.	Oxygen	4.	Sulphur dioxide

How many gram-molecules of oxygen are present in 6.02 × 10²⁴ molecules of CO?

1. 10 g molecules

2. 5 g molecules

3. 1 g molecules

4. 0.5 g molecules

The mass of carbon present in 0.5 mole of K₄[Fe(CN)₆] is:

1. 1.8 g

2. 18 g

3.  3.6 g

4.  36 g

Find the number of moles of BaCO₃ that contain 1.5 moles of oxygen atoms.

1. 0.5

2. 1.0

3. 3.0

4. 6.02 ×10²³

The oxide of metal contains 40% by mass of oxygen. The percentage of chlorine in the chloride of the metal is

1. 84.7

2. 74.7

3. 64.7

4. 44.7

The empirical formula of an organic compound containing carbon and hydrogen is CH₂. The mass of one litre of this organic gas at STP  is exactly equal to that of one litre of N₂ at STP. Therefore, the molecular formula of the organic gas is:

1. C₂H₄

2. C₃H₆

3. C₆H₁₂

4. C₄H₈

A sample of pure compound is found to have Na = 0.0887 mole, O = 0.132 mole, C = 2.65 × 10²² atoms.

The empirical formula of the compound is :

1. Na₂CO₃

2. Na₃O₂C₅

3. ${\mathrm{Na}}_{0.0887}{0}_{0.132}{\mathrm{C}}_{2.65\times {10}^{22}}$

4. NaCO

An organic compound containing C, H, and N gave the following on analysis: C = 40%, H = 13.3% and N = 46.67%. Its empirical formula would be:

1. CHN
2. C₂H₂N
3. CH₄N
4. C₂H₇N

An organic compound has the following composition by mass: C = 40.687%, H = 5.085%, O = 54.228%. Given vapour density = 59, find its molecular formula.

1. C₄H₆O₄

2. C₄H₆O₂

3. C₄H₄O₂

4. None of the above

When 4.77 g of NaCl is mixed with 5.77 g of AgNO₃, AgCl precipitates according to the reaction:

NaCl + AgNO₃ → AgCl↓ + NaNO₃

What is the mass of AgCl precipitated?

1.  11.70 gm.

2.  9.70 gm.

3.  4.86 gm.

4.  2.86 gm.