See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

(A)   2 H O 3 2 5 2HNO N O oxide of nitrogen   (B)   2 H O 2 4 3 H SO SO oxide of sulphur   (C)   2 H O 4 2 7 2HClO Cl O oxide of chloride   (D)   2 H O 2 4 2 2 7 2H SO H S O oxo acid    (A), (B) and (C) are oxides and not oxo-acids.