The process with negative entropy change is :

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Question:
The process with negative entropy change is :

Dissolution of iodine in water
Synthesis of ammonia from $\mathrm{N}_{2}$ and $\mathrm{H}_{2}$
Dissolution of $\mathrm{CaSO}_{4}$ (s) to $\mathrm{CaO}(\mathrm{s})$ and $\mathrm{SO}_{3}(\mathrm{~g})$
Subimation of dry ice

Correct Option: , 2

Solution:

$\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) ; \Delta \mathrm{n}_{\mathrm{g}}<0$