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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Chemistry
Chapter: States of Matter

NTA Abhyas 2020 · Chemistry · States of Matter

It is observed that H _ 2 and He gases always show positive...

It is observed that

{H}_{2}

and He gases always show positive deviation from ideal behaviour i.e., Z > 1. This is because

Options

Athe value of 'a' is very large due to high attractive forces
B $the weak intermolecular forces of attraction due to which 'a' is very small and \dfrac{a}{V^{2}}$ is negligible
Cthe value of 'b' is very large due to large size of the molecules
Dboth 'a' and 'b' are very small and negligible

Correct answer

B. $the weak intermolecular forces of attraction due to which 'a' is very small and \dfrac{a}{V^{2}}$ is negligible

Step-by-step solution

Due to weak intermolecular forces of attraction,

{H}_{2}

and He gases show the value of Z > 1 and always show positive deviation at any pressure.

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