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The incorrect statement according to second law of thermodynamics is

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Heat cannot flow from colder body to a hotter body of its own

All spontaneous processes are thermodynamically irreversible

Heat can be converted into work completely without causing some permanent change in the system (or) surroundings

Perpetual motion machine of second kind is not possible

answer is C.

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Detailed Solution

Heat $⟶$ hot body $⟶$ cold body

Universe $⟶$ Spontaneous process $⟶$ irreversible

Heat cannot be converted into work completely without causing some permanent change in the system (or) surroundings

Hence the correct answer is (C) Heat can be converted into work completely without causing some permanent change in the system (or) surroundings.

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