Second law of thermodynamics defines :

heat

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work

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enthalpy

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entropy

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Solution

The correct option is D entropy
The second law of thermodynamics states that the total entropy of an isolated system always increases over time, or remains constant in ideal cases where the system is in a steady state or undergoing a reversible process. The increase in entropy accounts for the irreversibility of natural processes.

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Similar questions

Define zeroth law of thermodynamics.

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

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