(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

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

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

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

(A) is True but (R) is False

Both (A) and (R) are false

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

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.