During which of the following processes, does entropy decrease ? … - Vidyadip

MCQ

During which of the following processes, does entropy decrease ?

$(A)$ Freezing of water to ice at $0^{\circ} C$

$(B)$ Freezing of water to ice at $-10^{\circ} C$

$(C)$ $N _{2}( g )+3 H _{2}( g ) \rightarrow 2 NH _{3}( g )$

$(D)$ Adsorption of $CO ( g )$ and lead surface

$(E)$ Dissolution of $NaCl$ in water

A
$(A), (B), (C)$ and $(D)$ only
B
$(B)$ and $(C)$ only
C
$(A)$ and $(E)$ only
D
$(A), (C)$ and $(E)$ only

✓

Answer

$(A)$ Water $\stackrel{0^{\circ} C }{\longrightarrow}$ ice $; \Delta S =- ve$

$(B)$ Water $\stackrel{-10^{\circ} C }{\longrightarrow}$ ice; $\Delta S =- ve$

$(C)$ $N _{2}( g )+3 H _{2}( g ) \rightarrow 2 NH _{3}( g ) ; \Delta S =- ve$

$(D)$ Adsorption; $\Delta S =- ve$

$(E)$ $NaCl ( s ) \rightarrow Na ^{+}( aq )+ Cl ^{-}( aq ) ; \Delta S =+ ve$

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