NEET levelSingle correct optionDifficulty 1 of 3rg113
Assertion (A): The compressibility factor of a real gas is less than 1 at moderate pressures and low temperature. Reason (R): At these conditions the attractive forces between molecules dominate over the finite volume effect. Choose the correct option.
ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true
Answer: A
At low temperature and moderate pressure molecules are close enough to attract each other but not so crowded that excluded volume dominates. Attraction reduces the pressure, so Z=PV/nRT is less than 1. R correctly explains A.