• # question_answer The correct order of acidic strength [Pb. CET 2004] A) $C{{l}_{2}}{{O}_{7}}>S{{O}_{2}}>{{P}_{4}}{{O}_{10}}$ B) ${{K}_{2}}>CaO>MgO$ C) $C{{O}_{2}}>{{N}_{2}}{{O}_{5}}>S{{O}_{3}}$ D) $N{{a}_{2}}O>MgO>A{{l}_{2}}{{O}_{3}}$

Acidic nature  of oxide $\propto$ Non metallic nature of element Non metallic nature decrease in the order $Cl>S>P$.