Question

For which of the following processes would there decrease in entropy? A. melting ice B. separation of a compound C. boiling water D. freezing water

Answer 1

The answer is D. freezing water.

Answer 2

For the answer to the question above, entropy is basically a measure of how organized or disorganized energy is in a system of atoms/molecules.
Melting ice, decomposing a compound and boiling water all cause a greater dispersal of energy, and so for them, entropy is increasing.
I hope this helps