Assertion :When two systems which are in thermal equilibrium with a third system, then all systems will be in thermal equilibrium with each other. Reason: The heat flows spontaneously from a system at a higher temperature to a lower temperature in a system.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion

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Assertion is correct, but Reason is incorrect

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Assertion is incorrect, but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
If, two bodies are in thermal equilibrium, they have same temperature.

By zeroth law of thermodynamics, if System A and B are in thermal equilibrium with C, then A and B are also in thermal equilibrium with each other.
Because heat flows naturally from body of higher temperature to the body of lower temperature till both attains the same temperature.
So both the Assertion and Reason are correct and Reason correctly explains the Assertion.

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