(A) : Compressibility factor for hydrogen varies with pressure with positive slope at all pressures
(R) : Even at low pressures, repulsive forces dominate in hydrogen gas

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Both (A) and (R) are correct and (R) is the correct explanation of (A)

(A) is True but (R) is False

Both (A) and (R) are false

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

answer is A.

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Detailed Solution

In case of hydrogen, compressibility factor (Z) increases with pressure.
At 273K, Z > 1, which show that it is difficult to compress the gas. In this case repulsive forces dominate. Note: For ideal gases, Z = 1. For real gases, Z $\neq$ 1.
If Z < 1, negative deviation and the gas is more compressible than expected.
If Z > 1, positive deviation and the gas is less compressible than expected.

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