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Which of the following reactions will involve largest change in the entropy function?

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C (g) + O_{2} (g) ⟶ {CO}_{2} (g)

{CO}_{2} (g) ⟶ CO (g) + \frac{1}{2} O_{2} (g)

2 {NH}_{3} (g) ⟶ N_{2} (g) + 3 H_{2} (g)

2 {SO}_{3} (g) ⟶ 2 {SO}_{2} (g) + O_{2} (g)

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detailed solution

Correct option is C

Larger the change in gaseous molecules, larger the entropy change.

Thus, the correct option is $2 {NH}_{3} (g) ⟶ N_{2} (g) + 3 H_{2} (g)$

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