Which of the following oxides is not expected to react with sodium hydroxide? [CBSE AIPMT 2009]

$B_{2} O_{3}$

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$C a O$

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$S i O_{2}$

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$B a O$

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Solution

The correct option is B
$C a O$

Sodium hydroxide, NaOH, being a strong alkali never react with a basic oxide (compound). Among the given options, $B_{2} O_{3}$ and BeO are amphoteric oxides, $S i O_{2}$ is an acidic oxide and CaO is a basic oxide. Therefore, NaOH does not react with CaO.

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