The standard enthalpies of elements in their standard(natural) states are taken as zero. On basis of this statement, we can say that the enthalpy of formation of a compound :

Is 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 A 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 compound
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Q. Since, the enthalpy of the elements in their standard states is taken to be zero, the heat of formation

(Δ H_{f})

of compounds:

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The standard enthalpies of elements in their standard(natural) states are taken as zero. On basis of this statement, we can say that the enthalpy of formation of a compound :

The correct option is A 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 A 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.