Which one of the following involves a decreas | vedclass

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(D) Entropy $(S)$ is a measure of the randomness or disorder of a system. $A$ decrease in entropy occurs when the system becomes more ordered,such as

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$CaO_{(s)} + CO_{2(g)} \longrightarrow CaCO_{3(s)}$

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(D) Entropy $(S)$ is a measure of the randomness or disorder of a system. $A$ decrease in entropy occurs when the system becomes more ordered,such as when gas molecules are consumed to form a solid.In option $D$,$CaO_{(s)} + CO_{2(g)} \longrightarrow CaCO_{3(s)}$,one mole of gas $(CO_2)$ is consumed to form a solid product $(CaCO_3)$.Since the number of moles of gaseous species decreases from $1$ to $0$,the randomness of the system decreases,leading to a decrease in entropy $(\Delta S < 0)$.

Which one of the following involves a decrease in entropy?

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