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Standard heats of formation are _________ for exothermic reaction.

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Standard heats of formation are _________ for exothermic reaction.

(a) Negative

(b) Positive

(c) Zero

(d) None of the mentioned

I have been asked this question in an interview for internship.

This interesting question is from Energy Balances for a Chemical Reaction topic in chapter Energy Balances of Chemical Process Calculation

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Right choice is (a) Negative

To elaborate: Standard heats of formation are negative for exothermic reaction.

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