When disorder of a system increases,the change is said to be

For which one of the following reactions is the entropy change positive?

When a solid is converted into liquid,entropy

What is the unit of entropy?

When a liquid boils,there is

In a reversible expansion,one mole of gas is expanded isothermally at $200 \ K$ till its volume increases $10$ times. Calculate $\Delta S_{total}$ at equilibrium (in $J \ K^{-1}$)?