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

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

Which of the following has the highest entropy per mole?

Predict in which of the following,entropy increases or decreases:
$(i)$ $A$ liquid crystallizes into a solid.
$(ii)$ Temperature of a crystalline solid is raised from $0 \, K$ to $115 \, K$.
$(iii)$ $2NaHCO_{3(s)} \to Na_2CO_{3(s)} + CO_{2(g)} + H_2O_{(g)}$
$(iv)$ $H_{2(g)} \to 2H_{(g)}$

Which one of the following has $\Delta S^o$ greater than zero?

For a spontaneous process,