Question

Which of the following gas has the largest value of 'a' Van Der Waal's Constant?

• A. ${\mathrm{CO}}_2$
• B. ${\mathrm{NO}}_2$
• C. ${\mathrm{H}}_2$
• D. ${\mathrm{NH}}_3$

Answer 1

The correct option is D

${\mathrm{NH}}_3$

The explanation for the correct answer:

(D) ${\mathrm{NH}}_3$

1. Wan Der Vaal's constant ‘a’ is the intermolecular force between the atoms in a molecule.
2. ${\mathrm{NH}}_3$ has high inter molecular forces as its shows polarity in $\mathrm{N}-\mathrm{H}$ bond causes strong Hydrogen bonding.
3. Due to strong Hydrogen bonding ${\mathrm{NH}}_3$ which increases Wan Der Vaal's constant ‘a’ .
4. The value of Wan Der Vaal's constant ‘a’ of ${\mathrm{NH}}_3$ is $4.17$.
5. Thus, ${\mathrm{NH}}_3$ has the largest value of ${\mathrm{NH}}_3$ Wan Der Vaal's constant ‘a’

The explanation for the incorrect answers

(A) ${\mathrm{CO}}_2$

1. The value of Wan Der Vaal's constant ‘a for ${\mathrm{CO}}_2$ is $3.59$.
2. The value of Wan Der Vaal's constant ‘a is lesser than that of ${\mathrm{NH}}_3$.
3. Thus, this is incorrect option.

(B) ${\mathrm{NO}}_2$

1. The value of Wan Der Vaal's constant ‘a for ${\mathrm{NO}}_2$ is lesser than that of .${\mathrm{NH}}_3$
2. Due to weak hydrogen bonding, they have less value of ‘a’ Wan Der Vaal's constant.
3. Thus, it is an incorrect option.

(C)${\mathrm{H}}_2$

1. The value of Wan Der Vaal's constant ‘a for ${\mathrm{H}}_2$ is $0.244$.
2. The value of Wan Der Vaal's constant ‘a' for ${\mathrm{H}}_2$ is very less than ${\mathrm{NH}}_3$.
3. Thus, this is also an incorrect option.

Thus, ${\mathrm{NH}}_3$ has the largest value of Wan Der Vaal's constant ‘a'. Therefore, option D is correct.