Question
Chemistry Question on Thermodynamics
Which of the following processes is a nonspontaneous process?
A
Dissolution of salt or sugar in water
B
Mixing of different gases through diffusion
C
Precipitation of copper when zinc rod is dipped in aqueous solution of copper sulphate
D
Flow of heat from a cold body to a hot body in contact
Answer
Flow of heat from a cold body to a hot body in contact
Explanation
Solution
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.