Question

Read the following statement and explanation and choose the correct option.
Assertion : The value of van der Waals' constant 'a' is larger for ammonia than for nitrogen.
Reason : Hydrogen bonding is present in ammonia.

• A. Both assertion and reason are correct, and reason is the correct explantion of the assertion.
• B. Both assertion and reason are correct, but reason is not the correct explantion of the assertion.
• C. Both assertion and reason are correct.
• D. Both assertion and reason are incorrect.

Answer 1

The correct option is A Both assertion and reason are correct, and reason is the correct explantion of the assertion.

Van der Waals constant 'a' indicates the magnitude of the attractive forces among the gas molecules. There is a strong intermolecular hydrogen bonding in ammonia molecule which shows constant 'a' is higher for $N{H}_3$. So reason is the correct explanation for assertion.