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The p-Block Elements
Question
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which of the following oxides is not expected to react with sodium hydroxide?

  • B2O3

  • CaO

  • SiO2

  • BeO

Answer

B.

CaO

Generally, acids react with bases and bases (alkalies) react with acids.
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 a acidic oxide and CaO is a basic oxide. Therefore, NaOH does not react with CaO.

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