A) Dissolution of a salt in water
B) Expansion of a gas into vacuum
C) Melting of ice
D) Passage of a gas from a lower pressure to a higher pressure
Correct Answer: D
Solution :
A non-spontaneous process is forbidden and is made to take place only by supplying energy continuously from outside the system. Hence, passage of a gas from a lower pressure to a higher pressure is a non-spontenous reaction.
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