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Hydrides of Group 16

Which of the ...

Question

Which of the following oxides when dissolved in water gives a solution which turns blue litmus red?

A

MgO

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B

CaO

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C

CO

_{2}

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D

CuO

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Solution

The correct option is D CO $_{2}$
$C O_{2} + H_{2} O ⟶ H_{2} C O_{3}$

Carbon dioxide, when it dissolves in water, it will form carbonic acid. This lowers the pH and turns the blue litmus paper red.

Hence, option C is correct.

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