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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