Assertion :When a hot substance is mixed with a cold substance, then the temperature of hot substance gradually decreases Reason: Heat always flows from a body of high temperature to the body of low temperature

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
When the cold substance is mixed with hot substance, then the temperature cold body will rise and the temperature of hot body decrease. The heat will flow from hot to cold body until they attend a same temperature or thermal equilibrium.
Hence both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hence option A is correct.

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