Question

What is the anhydride of perchloric acid?

Answer 1

Of `Cl_2O_7", chlorine heptoxide"`................or `"perchloric anhydride"`...........

Explanation:

This is the anhydride of perchloric acid, `HClO_4`, i.e. `O_3Cl-O-ClO_3`; we have `Cl(VII)`, i.e. the maximum Group oxidation number is expressed.