Which one of the following statements about the properties of gases is NOT corre

Question

Which one of the following statements about the properties of gases is NOT correct?

a. At high pressures, the attractive forces between molecules cause a real gas to deviate from ideal gas behavior, and the van der Waals a factor adjusts for this.
b. At high pressures, the finite size of the molecules causes a real gas to deviate from ideal gas behavior, and the van der Waals b factor adjusts for this.
c. The ratio PV/RT = 1 for one mole of an ideal gas.
d. The ratio PV/nRT < 1 because of repulsive interactions between the molecules.
e. The ratio PV/nRT > 1 because of the finite size and repulsive force of the molecules.

Explanation / Answer

At high pressure the real gas deviates from ideal gas behaviour because of two factors
1)interaction between the molecules and
2) size or volume of the molecules
these are compensated by vanderwaals factor.
So (a) and (b) are correct

(PV/nRT) is called compressibility factor (Z)

If Z=1 for an ideal gas for one mole gas.
If Z<1 because of attractive interactions of molecules in real gases.
If Z>1 because of repusive interactions of molecules in real gases.
So (c) and (e) are correct

Finally incorrect option is (d)

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