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 N2, 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.
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 . 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