Which of the following processes takes place with decrease of entropy?

S o l i d \to g a s

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s u g a r + w a t e r \to s o l u t i o n

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N H_{3 (g)} + H C l_{(g)} \to N H_{4} C l_{(s)}

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A_{(g)} + B_{(g)} \to m i x t u r e

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Solution

The correct option is C $N H_{3 (g)} + H C l_{(g)} \to N H_{4} C l_{(s)}$
The structure of a solid is usually well ordered, the structure of a liquid is less ordered, and that of a gas is quite random. Entropy of mixing is higher than the individual separate reactants. In option (C) two gases changing to the one solid product. The product side is more organised and thus has less entropy.

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Similar questions

A g (a q) + C l (a q) \to A g C l (s)

N H_{4} C l (s) \to N H_{3} (g) + H C l (g)

2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

{N H}_{3} (g) + H C l (g) ⟶ {N H}_{4} C l (s)

A g^{+} (a q) + C l^{-} (a q) \to A g C l (s)

N H_{4} C l (s) \to N H_{3} (g) + H C l (g)

2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

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H C l (g) + N H_{3} (g) - N H_{4} C l (s)

N H_{3}

20^{o} C

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