Question

Maximum deviation from ideal gas is expected from

• A. ${\mathrm{H}}_2$
• B. ${\mathrm{N}}_2$
• C. ${\mathrm{CH}}_4$
• D. ${\mathrm{NH}}_3\left(\mathrm{g}\right)$

Answer 1

The correct option is D

${\mathrm{NH}}_3\left(\mathrm{g}\right)$

Explanation for correct answer

Option (D) ${\mathbf{NH}}_{\mathbf{3}}$

1. The deviation from ideal gas depends on temperature and pressure.
2. ${\mathrm{NH}}_3$ is the most easily liquefiable gas out of given in the above, since it has strong intermolecular forces so the van der wall constant is high, so it exhibits maximum deviation.
3. Hence, option (D) is correct.

Explanation for incorrect answer

Option (A) ${\mathbf{H}}_{\mathbf{2}}$

1. As in ${\mathrm{H}}_2$ there is no Hydrogen bonding and also It has weak intermolecular forces.
2. So, It does exhibit maximum deviation, Option (A) is incorrect.

Option (B) ${\mathbf{N}}_{\mathbf{2}}$

1. As in ${\mathrm{N}}_2$ the intermolecular forces between the molecule is weak and are not easily liquifiable.
2. Hence, option (B) is incorrect.

Option (C) ${\mathbf{CH}}_{\mathbf{4}}$

1. As in ${\mathrm{CH}}_4$ the van der walls coefficient a and b is vey less and are not easily liquifiable.
2. Hence Option (C) is incorrect.

Therefore, due to strong intermolecular forces in ${\mathrm{NH}}_3$ It exhibits maximum deviation. Hence option (D) is incorrect.