States of Matte...

Gases deviate from ideal behaviour because their molecules

The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

(A): van der Waals equation is applicable only to non-ideal gases.

(R): Ideal gases obey the equation PV = nRT.

The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

(A): Helium shows only positive deviation from ideal behaviour.
(R): Helium is an inert gas.

The following question has four choices, out of which ONLY ONE is correct.

The density of ammonia gas at 25^oC and 2 atm pressure is about

Which gas has the same rate of diffusion as that of CO₂ at the same temperature and pressure?

The kinetic theory of gases predicts that total kinetic energy of gaseous assembly depends on

If two substances A and B have p^oA : p^oB = 1 : 2, where p^oA and p^oB are partial vapour pressures of A and B, and have mole fraction in the solution as 1 : 2, then what is the mole fraction of A in vapour phase?

The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

(A): SO₂ gas is easily liquefied while H₂ is not.

(R): SO₂ has low critical temperature, while H₂ has high critical temperature.

The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

(A): The pressure of a fixed amount of an ideal gas is proportional to its temperature at constant volume.
(R): Ideal gas molecules neither attract nor repel each other.

The root mean square speeds at STP for the gases H₂, N₂, O₂ and HBr are in the order