Assertion :The value of van der Waals' constant ' $a$ ' is larger for ammonia than for nitrogen. Reason: Hydrogen bonding is present in ammonia.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Van der Waals constant ' $a$ ' is an indirect measure of intermolecular attractive force.

Ammonia contains strong intermolecular forces of attraction. Intermolecular hydrogen bonding is absent in nitrogen.

Hence, the value of Van der Waal's constant ' $a$ ' is larger for ammonia than for nitrogen.

Hence, the correct answer is option $A$ .

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