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The enthalpies of elements under the following conditions are assumed to be 

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Zero at 298K and 1 atm 
Unity at 298K and 1 atm 
Zero at 273K and 1 atm 
Unity at 273K and 1 atm

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detailed solution

Correct option is A

There is no change in the formation of the elements when the enthalpies of the elements are in their standard states. 

It is assumed arbitrarily that the temperature to be zero at 298K and 1 atm.

Therefore, option (A) is correct.

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