Question

The value of van der Waals' constant ' $a$ ' for ammonia is larger than that of nitrogen gas. Molecular weight of ammonia is smaller than nitrogen gas.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (A)

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

Answer 2

Molecular weight of ammonia $\left( NH _{3}\right)=14+3=17$ Molecular weight of nitrogen gas $\left( N _{2}\right)=14+14=28$ Smaller the molecular weight of a gas, higher the value of van der Waals' constant ' $a$ ' for it. Thus, between $NH _{3}$ and $N _{2}$, the value of van der Waals' constant ' $a$ ' is higher for $NH _{3}$.