Assertion :The gases $H e$ and $H_{2}$ are very different in their behaviour at any temperature and pressure but their compressibility factors are nearly the same at the critical point. Reason: They have nearly the same critical constant.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
substance critical temperature critical pressure
Helium −267.96 °C (5.19 K) 2.24 atm (227 kPa)
Hydrogen −239.95 °C (33.20 K) 12.8 atm (1,300 kPa)
So their critical points are not same.

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