The volume of 0.0168 mol of O₂ obtained by decomposition of KClO₃ and collected by displacement of water is 428 ml at a pressure of 754 mm Hg at 25°C. The pressure of water vapour at 25°C is- 

1. 18 mm Hg

2. 20 mm Hg

3. 22 mm Hg

4. 24 mm Hg

The partial pressure of H₂ in a flask containing 2 g of H₂, 14 g of N_2, and 16 g of O₂ is-

1. 1/2 of the total pressure

2. 1/3 of the total pressure

3. 1/4 of the total pressure

4. 1/16 of the total pressure

Equal weights of methane and oxygen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by oxygen is- 

1. 1/3

2. 1/2

3. 2/3

4. $\frac{1}{3}\times \frac{273}{298}$  

In a flask of volume V litres, 0.2 mol of oxygen, 0.4 mol of nitrogen, 0.1 mol of ammonia and 0.3 mol of helium are enclosed at ${27}^{o}C$. If the total pressure exerted by these non-reacting gases is one atmosphere, the partial pressure exerted by nitrogen is-

1. 1 atm

2. 0.1 atm

3. 0.2 atm

4. 0.4 atm

Equal weights of ethane and hydrogen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by hydrogen is- 

1. 1 : 2

2. 1 : 1

3. 1 : 16

4. 15 : 16

A gaseous mixture contains 56 g of N₂, 44 g of CO₂ and 16 g of CH₄. The total pressure of the mixture is 720 mm Hg. The partial pressure of CH₄ is-

1. 180 mm

2. 360 mm

3. 540 mm

4. 720 mm

The time taken for a certain volume of a gas ‘X’ to diffuse through a small hole is 2 minutes. It takes 5.65 minutes for oxygen to diffuse under the similar conditions. The molecular weight of ‘X’ is [NCERT 1990]

(1) 8

(2) 4

(3) 16

(4) 32

The rate of diffusion of methane at a given temperature is twice that of gas X. The molecular weight of X is 

(1) 64.0

(2) 32.0

(3) 4.0

(4) 8.0

Density ratio of O₂ and H₂ is 16 : 1. The ratio of their r.m.s. velocities will be- 

1. 4 : 1

2. 1 : 16

3. 1 : 4

4. 16 : 1

The rate of diffusion of a gas having molecular weight just double of nitrogen gas is 56 mls^–1. The rate of diffusion of nitrogen will be

(1) 79.19 ml s^–1

(2) 112.0 ml s^–1

(3) 56 ml s^–1

(4) 90.0 ml s^–1