The enthalpies of all elements in their standard state $25^{o} C$ and one atmospheric pressure are:

same

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always positive

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always negative

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zero

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Solution

The correct option is C zero
All elements in their standard states have a standard enthalpy of formation of zero. Thus the enthalpies of all elements in their standard state $25^{o} C$ and one atmospheric pressure is zero.

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The enthalpies of all elements in their standard states are

Q. The enthalpies of all the elements in their standard states are:

The enthalpies of all elements in their standard states are:
(i) unity
(ii) zero
(iii) < 0
(iv) different for each element

The enthalpies of all elements in their standard state at

25^{\circ} C

are taken to be 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

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The enthalpies of all elements in their standard state 25oC and one atmospheric pressure are:

The correct option is C zeroAll elements in their standard states have a standard enthalpy of formation of zero. Thus the enthalpies of all elements in their standard state 25oC and one atmospheric pressure is zero.

The enthalpies of all elements in their standard state $25^{o} C$ and one atmospheric pressure are:

The correct option is C zero
All elements in their standard states have a standard enthalpy of formation of zero. Thus the enthalpies of all elements in their standard state $25^{o} C$ and one atmospheric pressure is zero.