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(B) Entropy $(S)$ is a measure of the randomness or disorder of a system.$(I)$ Melting of a solid: The transition from solid to liquid increases the f

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$I, II$ and $IV$

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(B) Entropy $(S)$ is a measure of the randomness or disorder of a system.$(I)$ Melting of a solid: The transition from solid to liquid increases the freedom of movement of particles,thus increasing entropy.$(II)$ Mixing of gases: Mixing increases the number of possible arrangements of gas molecules,leading to an increase in entropy.$(III)$ Compression of a gas: Compressing a gas reduces the volume available to the molecules,decreasing their randomness and thus decreasing entropy.$(IV)$ Expansion of a gas: Expanding a gas increases the volume available to the molecules,increasing their randomness and thus increasing entropy.Therefore,processes $(I)$,$(II)$,and $(IV)$ are associated with an increase in entropy.

Which of the following processes is associated with an increase in entropy?
$(I)$ Melting of a solid
$(II)$ Mixing of gases
$(III)$ Compression of a gas
$(IV)$ Expansion of a gas

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Which of the following processes is associated with an increase in entropy?$(I)$ Melting of a solid$(II)$ Mixing of gases$(III)$ Compression of a gas$(IV)$ Expansion of a gas