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Question

Which of the following process is non-spontaneous?

A
Heat flow from hot end to cool end.
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B
Water flow from higher level to lower level.
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C
Gas flow from lower pressure region to higher pressure region.
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D
Gas flow from higher pressure region to lower pressure region.
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Solution

The correct option is C Gas flow from lower pressure region to higher pressure region.
Gas flowing from higher pressure region to lower pressure region is a natural process. Similarly, option A and B are natural. Natural processes are spontaneous. Therefore, flow of gas from lower pressure to higher pressure region is non-spontaneous.

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