Which law of thermodynamic, introduces the concept of entropy

first law

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zeroth law

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third law

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second law

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Solution

The correct option is D second law
The second law of thermodynamics predict's direction of natural change. It do so with the help of state function 'S' - called entropy of system.

Suggest Corrections

List I	List II
A. Zeroth law of thermodynamics	$1.$ Give us the concept of temperature
B. First law of thermodynamics	$2.$ Defines internal energy
C. Second law of thermodynamics	$3.$ Change in internal energy is zero
D. In a complete cycle of changes	$4.$ The efficiency of on engine is always less than unity