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Question

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


A

B2O3

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B

CaO

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C

SiO2

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D

BaO

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Solution

The correct option is B

CaO


Sodium hydroxide, NaOH, being a strong alkali never react with a basic oxide (compound). Among the given options, B2O3 and BeO are amphoteric oxides, SiO2 is an acidic oxide and CaO is a basic oxide. Therefore, NaOH does not react with CaO.


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