Question

The curve of pressure volume (PV) against pressure (P) of the gas at a particular temperature is as shown, according to the graph which of the following is incorrect (in the low pressure region):

• A. H2 and He shows +ve deviation from ideal gas equation.
• B. CO, CH4 and O2 show negative deviation from ideal gas equation.
• C. H2 and He show negative deviation while CO, CH4 and O2 show positive deviation.
• D. H2 and He are less compressible than that of an ideal gas while CO, CH4 and O2 more compressible than that of ideal gas.

Answer 1

Answer: (C)

H2 and He show negative deviation while CO, CH4 and O2 show positive deviation.

Answer 2

If Z > 1 positive deviation

Z < 1 negative deviation