Which of the following is the correct expression for an irreversible process?

During which of the following processes does entropy decrease?
$(A)$ Freezing of water to ice at $0^{\circ} C$
$(B)$ Freezing of water to ice at $-10^{\circ} C$
$(C)$ $N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}$
$(D)$ Adsorption of $CO_{(g)}$ on a lead surface
$(E)$ Dissolution of $NaCl$ in water

One mole of an ideal gas expands adiabatically and reversibly from its initial pressure to half of its initial pressure. What will be the value of $\Delta S$ in $J \ K^{-1} \ mol^{-1}$? $[\ln 2 = 0.693$ and $R = 8.314 \ J \ mol^{-1} \ K^{-1}]$

Assertion : Entropy of ice is less than water.
Reason : Ice has a cage-like structure.

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

When a solid is converted into liquid,entropy