Question

Cl₂O₇ is the anhydride of which acid?

• A. Hypochlorous acid (HClO)
• B. Chlorous acid (HClO₂)
• C. Chloric acid (HClO₃)
• D. Perchloric acid (HClO₄)

Hint:

Higher oxides of chlorine (like Cl\textsubscript{2}O\textsubscript{7}) form oxyacids with higher oxidation states. Cl\textsubscript{2}O\textsubscript{7} corresponds to perchloric acid, where Cl is in +7 state.