For an isolated system,$\Delta U = 0,$ what will be $\Delta S?$

The molar entropy is maximum for

Melting point of a solid is $x \ K$ and its latent heat of fusion is $600 \ cal \ mol^{-1}$. The entropy change for fusion of $1 \ mol$ solid is $2 \ cal \ mol^{-1} \ K^{-1}$. The value of $x$ will be......$K$

Identify from the following physical transformations that exhibits a decrease in entropy.

One mole of which of the following has the highest entropy?

In which of the following reactions is $\Delta S$ maximum?