Question

When ice melts its entropy:

• A. decreases
• B. increases
• C. become zero
• D. remains constant

Answer 1

Answer: (B)

increases

Entropy is a measure of diffusion or randomness of the system. Greater the randomness, higher will be the entropy. Since the mobility of molecules i.e. diffusion/ randomness in liquid (molten) form is higher than solid they have higher entropy.

Thereby, upon melting of ice entropy increases as: $H_{2}O\left(s\right)\to H_{2}O\left(l\right)$

Option $B$ is the correct answer.