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Question

Assertion :If a gas has compressibility factory (Z) greater than unity, then repulsive forces are dominant. Reason: Value of Z decreases with increase in pressure.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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
Deviations of the compressibility factor z, from 1 unity are due to inter-molecular attractive and repulsive forces. At a given temperature and pressure, repulsive forces tend to make the volume larger than for an ideal gas, when these forces dominate z is greater than unity .

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