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Question

Assertion :A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Reason: All exothermic reactions are accompanied by decrease of radomness.

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
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is correct but Reason is incorrect
G=HTS
When S decreases; S=negative then G will be negative only when H is much more negative or exothermic G=negative (spontaneous)
It is not necessary for every reaction which is exothermic need to be decreased in S, there will be increase in S also.

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