Assertion (A) : Two systems which are in thermal equilibrium with a third system, are in thermal equilibrium with each other. Reason (R) : The heat flows always from a system at higher temperature to a system at a lower temperature.
A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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B
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
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C
Assertion is true but Reason is false.
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D
Both Assertion and Reason are false.
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Solution
The correct option is D Both Assertion and Reason are true and Reason is the correct explanation of Assertion. The heat flows from a system at higher temperature to a system at a lower temperature. Therefore, two systems which are in thermal equilibrium are made to contact with a third system. The three systems will eventually reach in thermal equilibrium with each other.