Chemical Thermodynamics Question 25

Question: For which of the processes is $ \Delta S $ negative [Pb. PMT 1998]

Options:

A) $ H_2(g)\to 2H(g) $

B) $ N_2(g),1atm\to N_2(g),8,atm $

C) $ 2SO_3(g)\to 2SO_2(g)+O_2(g) $

D) $ {C_{(diamond)}}\to {C_{(graphite)}} $

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Answer:

Correct Answer: B

Solution:

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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