Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation $(Δ_{f} H)$ of compounds

is always negative

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is always positive

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may be negative or positive

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is zero

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Solution

The correct option is B may be negative or positive
Enthalpy of Formation : The heat evolved or absorbed when 1 mole of a substance is formed from its constituent elements under constant pressure and temperature conditions is called enthalpy of formation.
It can be positive/negative or zero depends upon particular reaction.

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Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation

(Δ_{f} H)

of compounds is zero.

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound
(a) is always negative
(b) is always positive
(c) may be positive or negative
(d) is never negative

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

(Δ H_{f})

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Q. The enthalpies of elements are always taken to be zero.

Q. 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 :

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Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation (ΔfH) of compounds

Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation $(Δ_{f} H)$ of compounds