For which of the following processes, $Δ S$ is negative

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$O_{2} (g, 1 atm) \to O_{2} (g, 2 atm)$

$N_{2} (g) \to 2 N (g)$

$C_{(D i m o n d)} \to C_{(G r a p h i t e)}$

Heating of an iron rod

answer is C.

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Detailed Solution

In option A, B and D entropy is increasing where as in C option when pressure is increased $O_{2}$ molecules come closer to each other hence entropy decreases $Δ S < 0$

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