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Question

Assertion :All chemical reactions are accompanied by changes in energy. Reason: Energy is always required to drive a chemical reaction.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is C Assertion is correct but Reason is incorrect
Energy changes of all reactions can either be exothermic or endothermic. If two substances react and the temperature of the mixture decreases, the reaction is endothermic. If two substances react and the temperature of the mixture increases, the reaction is exothermic. All chemical reactions are not accompanied by intake of energy.

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