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Question

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


A
BeO
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B
B2O3
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C
CaO
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D
SiO2
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Solution

The correct option is A $$CaO$$
$$CaO$$ is not expected to react with $$NaOH$$ because $$NaOH$$ is a base and it can only react with either an acidic oxide or an amphoteric oxide. 
Among given options $$BeO$$ is an amphoteric oxide while $$B_2O_3$$ and $$SiO_2$$ are acidic oxides.Thus, all of them react with $$NaOH$$ to form salts.
$$CaO$$, on the other hand, is a basic oxide and hence it will not react with $$NaOH$$.

Chemistry

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