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MHT CET Medical202623 April 2026Evening ShiftChemistrys Block ElementsActual

Identify the pair of basic oxides from the following.

Options

  1. ACaO and Na ₂ O
  2. BSO ₂ and Cl ₂ O
  3. CBaO and N ₂ O ₅
  4. DCO and N ₂ O

Correct answer

A. CaO and Na ₂ O

Step-by-step solution

Oxides of metals are generally basic in nature, while oxides of non-metals are generally acidic or neutral. CaO and Na ₂ O are oxides of an alkaline earth metal (Ca) and an alkali metal (Na) respectively. Both react with water to form strong bases ( Ca(OH) ₂ and NaOH ). Hence, they are basic oxides. SO ₂ and Cl ₂ O are non-metallic oxides and are acidic in nature. BaO is a basic oxide, but N ₂ O ₅ is an acidic oxide. CO and N ₂ O are neutral oxides. Answer: CaO and Na ₂ O

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