Q66 / 200 · NEET 2009 (Screening) · Chemistry

Which of the following oxides is not expected to react with sodium hydroxide ?

  • A
    $\mathrm{B}_2 \mathrm{O}_3$
  • Correct answer
    B
    $\mathrm{CaO}$
  • C
    $\mathrm{SiO}_2$
  • D
    $\mathrm{BeO}$

Solution

Key Idea Generally acids react with bases and bases (alkalies) react with acids. Sodium hydroxide, $\mathrm{NaOH}$, being a strong alkali, never react with a basic oxide (compound). Among the given options, $\mathrm{B}_2 \mathrm{O}_3$ and $\mathrm{BeO}$ are amphoteric oxides, $\mathrm{SiO}_2$ is a acidic oxide and $\mathrm{CaO}$ is a basic oxide. Therefore, $\mathrm{NaOH}$ does not react with $\mathrm{CaO}$.

Hence, the correct answer is option: 'B'.

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