Which of the following oxides gives pink colour with phenolphthalein indicator in aqueous solution?

N_{2} O

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N O

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C a O

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C O_{2}

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Solution

The correct option is D $C a O$
$C a O$ gives pink colour with phenolphthalein indicator in aqueous solution.
An aqueous solution of $C a O$ is alkaline in nature due to hydrolysis.
$C a O + H_{2} O \to C a (O H)_{2} + 15000 c a l$
The phenolphthalein indicator is colourless in acidic medium and pink coloured in alkaline medium.
The aqueous solutions of $N_{2} O$ and NO are neutral.
The aqueous solution of $C O_{2}$ is acidic in nature.
$C O_{2} + H_{2} O ⇌ H_{2} C O_{3} carbonic acid$

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