MCQ
Which of the following processes takes place with decrease of entropy?
- ASolid $\to $ gas
- Bsugar $+$ water $\to $ solution
- ✓$NH_{3(g)} + HCl_{(g)} \to NH_4Cl_{(s)}$
- D$A_{(g)} + B_{(g)} \to $ mixture
✓
Answer
Correct option: C.
$NH_{3(g)} + HCl_{(g)} \to NH_4Cl_{(s)}$
c
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.
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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