Sulphur dioxide turns lime water milky due to the formation of _______.

calcium carbonate

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calcium sulphate

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calcium sulphite

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calcium bisulphite

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Solution

The correct option is C calcium sulphite
Sulphur dioxide forms a white precipitate called calcium sulphite $(C a S O_{3})$ on reaction with limewater $(C a (O H)_{2})$ .
This can be represented in the form of equation as follows:
$S O_{2} (g)$ + $C a (O H)_{2} (a q) \to$ $C a S O_{3} (s)$ + $H_{2} O (l)$

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Lime water turns milky when carbon dioxide gas is passed through it due to the formation of _________.

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