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Chemistry · PYQ NEET UG 2019(1)
हिन्दीIn which case change in entropy is negative?
Correct answer · Option 3
\( 2\text{H}_{2(\text{g})} \longrightarrow \text{H}_{2(\text{g})} \)
Explanation
Entropy decreases when the number of moles of gas decreases, as randomness decreases. In the reaction \( 2\text{H}_2 \rightarrow \text{H}_2 \), moles of gas decrease from 2 to 1, hence \( \Delta S \) is negative.
