11.The vapour density a diatomic gas with homoatomic molecules is 25. The atomoc mass of a gas will be

12.Under which of the following conditions, the real gases will approach the behaviour of ideal gas?

13.For ideal gas, isochors refer to the graphs between

14.One litre of gas weighs 2 g at 300 K and 1 atm pressure. If the pressure is made 0.75 atm, and temperature is brought down to 250 K, the gas will occupy a volume of

15.The magnitude of van der Waals forces depends upon