Chemistry - Thermochemistry Question with Solution | TestHub

In the following question, two statements are given: One labelled as Assertion $\mathbf{A}$ and the other as Reason $\mathbf{R}$. Examine the two statements carefully and mark the correct choice (A), (B), (C) and (D) according to the instructions given below

Assertion A : ${\Delta }_f{H}^0$ of sulphur (rhombic) at 25°C is zero.

Reason R : ${\Delta }_f{H}^0$ of all the elements in their standard state at 25°C is zero.