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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
MCQ
For which of the following processes $\Delta\text{S}$ is negative?
  • A
    $ \mathrm{H}_2(\mathrm{~g}) \rightarrow 2 \mathrm{H}(\mathrm{g}) $
  • ✓
    $ \mathrm{N}_2(\mathrm{~g}, 1 \mathrm{~atm}) \rightarrow \mathrm{N}_2(\mathrm{~g}, 5 \mathrm{~atm}) $
  • C
    $2 \mathrm{SO}_3(\mathrm{~g}) \rightarrow 2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g})$
  • D
    $\ce{C(diamond) \rightarrow C(graphite)}$
✓

Answer

Correct option: B.
$ \mathrm{N}_2(\mathrm{~g}, 1 \mathrm{~atm}) \rightarrow \mathrm{N}_2(\mathrm{~g}, 5 \mathrm{~atm}) $
At higher pressure $\ce{N_2(g)}$ will have less entropy, i.e. $\Delta\text{S}$ will be $- \ce{ve}$ because molecules will be less free to move at high pressure.

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