• # question_answer Which one is the anhydride of $HCl{{O}_{4}}$ [AIIMS 1983; BHU 1983; AMU 1984] A) $C{{l}_{2}}O$ B) $Cl{{O}_{2}}$ C) $C{{l}_{2}}{{O}_{6}}$ D) $C{{l}_{2}}{{O}_{7}}$

$2HCl{{O}_{4}}\,\to \,{{H}_{2}}O+C{{l}_{2}}{{O}_{7}}$.