# Gaseous State

### If Z is a compressibility factor, van der Waals equation at low pressure

If Z is a compressibility factor, van der Waals equation at low pressure can be written as

1. Z = 1+Pb/RT
2. Z = 1-a/(VRT)
3. Z = 1+RT/Pb
4. Z = 1-Pb/RT

### Equal masses of methane and oxygen are mixed in an empty container

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

1. 1/2
2. 1/3
3. 2/3
4. (1/3) * (273/298)

### According to the kinetic theory of gases, in an ideal gas

According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels

1. in a straight line path
2. in a wavy path
3. in a circular path
4. with an accelerated velocity

### In van der Waals equation of state of the gas law, the constant b

In van der Waals equation of state of the gas law, the constant b is a measure of

1. volume occupied by the molecules
2. intermolecular attraction
3. intermolecular repulsions
4. intermolecular collisions per unit volume

### For an ideal gas, number of moles per litre in terms of its pressure

For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T is

1. P/RT
2. PT/R
3. RT/P
4. PRT

### Which of the following is not an assumption of the kinetic theory of gases

Which of the following is not an assumption of the kinetic theory of gases?

1. A gas consists of many identical particles which are in continual motion.
2. Gas particles have negligible volume.
3. At high pressure, gas particles are difficult to compress.
4. Collisions of gas particles are perfectly elastic.