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  4. The enthalpies of the elements in their standard states are assumed to be

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Q. The enthalpies of the elements in their standard states are assumed to be

NTA AbhyasNTA Abhyas 2020

Solution:

The enthalpies of the elements in their standard states are assumed to be zero at $298K$
If natural form of elements is present then they have zero enthalpy of formation.
For example: dioxygen gas, dinitrogen gas, carbon in graphite are having zero enthalpy.