(A): The enthalpies of elements in their standard states are taken as zero.
(R): It is impossible to determine the absolute enthalpy of any substance.

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Both A and R are true but R is not the correct explanation of A

A is false but R is true

Both A and R are true and R is the correct explanation

A is true but R is false

answer is B.

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Detailed Solution

The enthalpies of elements in their standard states are considered as zero or maybe +ve/-ve.

On the other hand, the absolute enthalpy of any substance is not possible to determine.

$H = E + P V$

The internal energy cannot be determined. So, absolute enthalpy of any substance cannot be determined.

Hence, both the statements are true. But R is not the correct explanation of A.

Therefore, option (B) is correct.

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