Which of the following processes is a non-spontaneous process?

Dissolution of salt of sugar in\ water

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Mixing of different gases through diffusion.

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Precipitation of copper when zinc rod is dipped in aqueous solution of copper sulphate.

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Flow of heat from a cold body to a hot body in contact

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Solution

The correct option is C Flow of heat from a cold body to a hot body in contact
The physical or chemical processes which do not proceed by its own in a particular direction and requires outside help is called a non-spontaneous process.
Therefore, flow of heat from a cold body to a hot body is a non-spontaneous process as it requires external work as per Clausius.

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