$S O_{2}$ turns lime water milky due to formation of _______ .

calcium sulphite

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calcium carbonate

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calcium sulphide

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carbon dioxide

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Solution

The correct option is A calcium sulphite
In flue gas technology calcium oxide or lime reacts with sulphur dioxide to form calcium sulphite,
$C a O + {S O}_{2} \to {C a S O}_{3}$
Aerobic oxidation of calcium sulphite gives calcium sulphate anhydrite.

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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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