Question

Which of the following process is non-spontaneous?

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

Answer 1

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.