The compressibility factor for H₂ and He is usually:

1. >1                                     

2. =1

3. <1                                     

4. either of these

The compressibility factor of an ideal gas is:

1. zero                         

2. infinite

3. 1                               

4. -1

The compressibility of a gas is less than unity at STP. Therefore:

1. V_m > 22.4 litre                           

2. V_m < 22.4 litre

3. V_m = 22.4 litre                           

4. V_m = 44.8 litre

At high pressure, the compressibility factor 'Z' is equal to- 

1. Unity

2. 1-$\frac{\mathrm{Pb}}{\mathrm{RT}}$

3. 1+$\frac{\mathrm{Pb}}{\mathrm{RT}}$

4. Zero

The compressibility factor for a real gas at high pressure is:-

1. 1

2. 1+Pb/RT

3. 1-Pb/RT

4. 1-RT/Pb