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STD 11 - 5. Thermodynamics and thermochemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 5. Thermodynamics and thermochemistry4 Marks
MCQ
For which of the processes is $\Delta S$ negative
  • A
    ${H_2}(g) \to 2H(g)$
  • B
    ${N_2}(g)\,1\,atm \to {N_2}(g)\,8\,atm$
  • C
    $2S{O_3}(g) \to 2S{O_2}(g) + {O_2}(g)$
  • D
    ${C_{(diamond)}} \to {C_{(graphite)}}$
✓

Answer

$(b)$ Processes $(a)$  and $(c)$  take place with the increase of no. of moles of gaseous species and hence the disorder or entropy increases. $(b) $ on increasing pressure, disorder or randomness decreases and so also the entropy $(d)$  is endothermic process and $\Delta S$ is positive.

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