Q129 / 200 · MHT CET - Medical 2026 (23 April Shift 2) · Chemistry
Identify the pair of basic oxides from the following.
- Correct answerA$\text{CaO}$ and $\text{Na}_2\text{O}$
- B$\text{SO}_2$ and $\text{Cl}_2\text{O}$
- C$\text{BaO}$ and $\text{N}_2\text{O}_5$
- D$\text{CO}$ and $\text{N}_2\text{O}$
Solution
Oxides of metals are generally basic in nature, while oxides of non-metals are generally acidic or neutral.
$\text{CaO}$ and $\text{Na}_2\text{O}$ are oxides of an alkaline earth metal (Ca) and an alkali metal (Na) respectively. Both react with water to form strong bases ($\text{Ca(OH)}_2$ and $\text{NaOH}$). Hence, they are basic oxides.
$\text{SO}_2$ and $\text{Cl}_2\text{O}$ are non-metallic oxides and are acidic in nature.
$\text{BaO}$ is a basic oxide, but $\text{N}_2\text{O}_5$ is an acidic oxide.
$\text{CO}$ and $\text{N}_2\text{O}$ are neutral oxides.
Answer: $\text{CaO}$ and $\text{Na}_2\text{O}$
$\text{CaO}$ and $\text{Na}_2\text{O}$ are oxides of an alkaline earth metal (Ca) and an alkali metal (Na) respectively. Both react with water to form strong bases ($\text{Ca(OH)}_2$ and $\text{NaOH}$). Hence, they are basic oxides.
$\text{SO}_2$ and $\text{Cl}_2\text{O}$ are non-metallic oxides and are acidic in nature.
$\text{BaO}$ is a basic oxide, but $\text{N}_2\text{O}_5$ is an acidic oxide.
$\text{CO}$ and $\text{N}_2\text{O}$ are neutral oxides.
Answer: $\text{CaO}$ and $\text{Na}_2\text{O}$
Hence, the correct answer is option: 'A'.