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

is a always negative

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is always positive

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may be positive or negative

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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.

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

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

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.