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Question

Which of the following statements is correct according to the second law of thermodynamics?

A
All heat can be converted into work
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B
All heat cannot be converted into work
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C
Both (a) and (b) are correct.
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D
Both (a) and (b) are wrong.
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Solution

The correct option is B All heat cannot be converted into work
From Kelvin-Planck statement, it is impossible to construct a heat engine that extracts heat and fully utilizes it to produce work.
In other words, efficiency of a heat engine can never be 100%. Hence, all the heat energy can not be converted to work.

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