Q.

Statement I : At ordinary temperature H2 and He show negative deviations from ideal behaviour.Statement II : At ordinary temperature H2 and He molecules experience repulsions only

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a

Statement I and II are correct

b

Statement I is correct and Statement  II is incorrect

c

Statement I is incorrect and statement II is correct

d

Both statement - I and II are incorrect

answer is C.

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Detailed Solution

At a temperature below their critical temperature gases will experience attractilons. But the critical temperatures of He and H2 are very less.Due to their small size and very low critical temperature, hydrogen and helium experience repulsions at ordinary temperature.They show positive deviations from ideal behaviour.
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