The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound

(i) is always negative
(ii) is always positive
(iii) maybe positive or negative
(iv) is never negative


 

Answers (1)

The answer is option (iii) maybe positive or negative

Explanation: It can be positive or negative as the reaction could be exothermic or endothermic.

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