Question

_____________is a property that must decrease when a gas condenses into a liquid.

• A. Standard voltaic potential
• B. Entropy
• C. Enthalpy
• D. Reaction rate
• E. Gibbs free energy

Answer 1

Answer: (B)

Entropy

Option $B$ is the correct answer.

Entropy means randomness. In a gas, the molecules move more freely and randomly, hence the entropy of a gas is more. But when a gas condenses to a liquid, the molecules become more ordered and less free. Hence in a liquid, the entropy decreases.

Thus entropy decreases from gas to liquid