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(B) Entropy $(S)$ is a measure of the randomness or disorder of a system.$A$. Evaporation of a liquid to vapour increases disorder,so entropy increase

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$A, C$ and $D$

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(B) Entropy $(S)$ is a measure of the randomness or disorder of a system.$A$. Evaporation of a liquid to vapour increases disorder,so entropy increases.$B$. Lowering the temperature of a crystalline solid towards $0 \ K$ decreases the molecular motion and disorder,so entropy decreases.$C$. $2 NaHCO_{3(s)} \rightarrow Na_2CO_{3(s)} + CO_{2(g)} + H_2O_{(g)}$. Here,solid reactants produce gaseous products,leading to an increase in the number of moles of gas and thus an increase in entropy.$D$. $Cl_{2(g)} \rightarrow 2 Cl_{(g)}$. One mole of gaseous $Cl_2$ produces two moles of gaseous $Cl$ atoms,increasing the number of particles and disorder,so entropy increases.Therefore,processes $A, C,$ and $D$ result in an increase in entropy.

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