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Question

Which of following is a non spontaneous process?

A
Rusting of iron
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B
Boiling of water
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C
Diffusion
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D
Melting of ice
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Solution

The correct option is B Boiling of water
The processes in a, c and d are sponteneous as no external source of energy is required. They occur on their own spontaneously.

The process in option b (Boiling of water) is a non sponteneous process as it requires energy in the form of heat.

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