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(D) Entropy $(S)$ is a measure of the randomness or disorder of a system. $A$ positive entropy change $(\Delta S > 0)$ occurs when the system becomes

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$H_2O_{(l)} \longrightarrow H_2O_{(g)}$

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(D) Entropy $(S)$ is a measure of the randomness or disorder of a system. $A$ positive entropy change $(\Delta S > 0)$ occurs when the system becomes more disordered,such as during a phase transition from a more ordered state (liquid) to a less ordered state (gas).In the reaction $H_2O_{(l)} \longrightarrow H_2O_{(g)}$,liquid water is converted into water vapor. Since gas molecules have much higher randomness compared to liquid molecules,the entropy of the system increases,making $\Delta S$ positive.In other options,the reactions involve a decrease in the number of moles of gas or a transition from a disordered state to a more ordered state (like liquid to solid or gas to solid),which results in a negative entropy change.

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

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