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Question

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


A
is a always negative
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B
is always positive
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C
may be positive or negative
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D
is never negative
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Solution

The correct option is C may be positive or negative
The enthalpy of formation of a compound may be positive or negative as it can be exothermic or endothermic process.

Chemistry

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