Question

Positive deviation from ideal behaviour takes place because of
(a) molecular interaction between atoms and PV/nRT > 1
(b) molecular interaction between atoms and PV/nRT < 1
(c) finite size of atoms and PV/nRT > 1
(d) finite size of atoms and PV/nRT < 1

Answer 1

Positive deviation from ideal behaviour takes place because of finite size of atoms and PV/nRT > 1.

Option (C) is correct.

Explanation:

For positive deviation Z>1

The condition when repulsive force predominates.

When the volume is small at high pressure then b can not be neglected.

In van der Waal equation the term  a/V^ 2  is negligible in comparison to high Pressure.

Interaction between molecules is entirely repulsive.

However, the smaller the size of atoms more the repulsion between the atoms occur.

Thus the positive deviation from ideal behaviour takes place because of finite size of atoms and PV/nRT > 1.

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