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Question

Assertion: Greater the value of van der Waals constant 'a', easier is the liquefaction of gas.
Reason: 'a' indirectly measures the magnitude of attractive forces between the molecules.

A
Both assertion and reason are true and the reason is the correct explanation of assertion
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B
Both assertion and reason are true but the reason is not the correct explanation of assertion
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C
Assertion is true but reason is false
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D
Both assertion and reason are false
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Solution

The correct option is A Both assertion and reason are true and the reason is the correct explanation of assertion
Answer:-
The van der Waals equation is given as: (P+an2V2)(Vnb)=nRT
The ease of liquifaction of a gas depends on their inter-molecular force of attraction which in turn is measured in terms of van der Waals’ constant ‘a’. Hence, the higher the value of ‘a’, greater the inter-molecular force of attraction, easier the liquefaction.
Hence, both assertion and reason are true and the reason is the correct explanation of assertion.

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