Change in entropy is positive for

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

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$2O_3(g) \longrightarrow 3O_2(g)$

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(D) Entropy $(S)$ is a measure of the randomness or disorder of a system. $A$ positive change in entropy $(\Delta S > 0)$ occurs when the disorder of the system increases.$A$. $H_2O_{(g)} \longrightarrow H_2O_{(l)}$: Gas to liquid transition decreases disorder,so $\Delta S $B$. $H_2O_{(l)} \longrightarrow H_2O_{(s)}$: Liquid to solid transition decreases disorder,so $\Delta S $C$. $N_2(g) + 3H_2(g) \longrightarrow 2NH_3(g)$: The number of moles of gas decreases from $4$ to $2$,which decreases disorder,so $\Delta S $D$. $2O_3(g) \longrightarrow 3O_2(g)$: The number of moles of gas increases from $2$ to $3$. An increase in the number of gaseous molecules leads to an increase in disorder,so $\Delta S > 0$.

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