Chemistry Question Bank

In a closed room of 1000 m3, a perfume bottle is opened up. The whole room develops smell. This is due to which property of gases ?

A certain gas effuses through a small opening of a vessel at a rate which is exactly one-fifth the rate at which helium does the same. Thus, the molecular weight of the gas is

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

The relative rate of diffusion of helium w.r.t. methane under similar conditions of pressure and temperature is

Which of the following gas will have highest rate of diffusion?

If some moles of O2 diffuse in 18 sec and same moles of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas? (a) 18 x (b) 45 x (c) x (d) x

When r, P and M represent rate of diffusion, pressure and molecules mass, respectively, the ratio of the rate of diffusion (rA/rB) of two gases A and B, is given as

2 moles of each H ,SO and CH are kept in a container. A hole was made in the container. After 30 min, the order of partial pressure in the container will be (a) SO CH H P P P (b) H SO CH P P P (c) H CH SO P P P …

The atomic weight of C, N and O are 12, 14 and 16 respectively. Among the following pair of gases, which will diffuse at the same rate?

If the ratio of the rates of diffusion of two gases. A and B is 2:1, the ratio of their densities is

If the ratio of the rates of diffusion of two gases. A and B is 4:1, the ratio of their densities is

0.5 mole of each H2, SO2 and CH4 are kept in a container. A hole was made in the container. After 3 h, the order of partial pressure in the container will be (a) SO CH H P P P (b) H SO CH P P P (c) H CH SO P P P …

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

Equal weights of methane and hydrogen are mixed in an empty container at 25ºC. The fraction of the total pressure exerted by hydrogen is

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

A cylinder is filled with a gaseous mixture containing equal masses of CO and N2. The partial pressure ratio is : (a) N CO P P (b) CO N P 0.875 P (c) CO N P 2 P (d) CO N P 1/ 2 P

16 gm of oxygen and 3 gm of hydrogen are mixed and kept in 760 mm presusre at 0oC. The total volume occupied by the mixture will be nearly

Equal weights of two gases of molecular weight 4 and 40 are mixed. The pressure of the mixture is 1.1 atm. The partial pressure of the light gas in this mixture is

The ratio of partial pressure of a gaseous component to the total vapour pressure of the mixture is equal to

3.2 g of oxygen (At. wt. = 16) and 0.2 g of hydrogen (At. wt. = 1) are placed in a 1.12 litre flask at 0ºC. The total pressure of the gas mixture will be

Which of the following mixtures of gases does not obey Dalton’s law of partial pressure ?

If three unreactive gases having partial pressures PA, PB and PC and their moles are 1, 2, and 3 respectively then their total pressure will be :

A close vessel contains equal number of nitrogen and oxygen molecules at a pressure of P mm. If nitrogen is removed from the system, then the pressure will be

Same amount of hydrogen H2(g) and CH4(g) are mixed in a vessel at 25oC. The fraction of the total pressure exerted by hydrogen is

The pressure of a 1:4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere, what would be the partial pressure of dioxygen? (a) 0.8 10 atm x