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Which of the following is not a spontaneous process?

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in Chemistry – Class 11 by (148k points)
Which of the following is not a spontaneous process?

(a) sugar dissolves in water

(b) melting of iron

(c) rusting of iron

(d) evaporation of water

The question was asked in an online interview.

Query is from Thermodynamics topic in chapter Thermodynamics of Chemistry – Class 11

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The correct answer is (b) melting of iron

To explain I would say: A physical or chemical process which occurs by its on in a particular direction under a particular set of conditions without any force is known as a spontaneous process and it cannot be reversed. Here melting of iron is only possible when we supply a large amount of heat so it is not a spontaneous process.

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