The product obtained on passing excess carbondioxide through lime water is ___

C a C O_{3}

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C a (H C O_{3})_{2}

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C a H C O_{3}

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C a_{2} C O_{3}

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Solution

The correct option is B $C a (H C O_{3})_{2}$
Lime water is aqueous solution of $C a (O H)_{2}$ .
When $C O_{2}$ is passed through lime water, it turns milky due to formation of $C a C O_{3}$ .
If excess of $C O_{2}$ is added, precipitate of $C a C O_{3}$ dissolve to form $C a (H C O_{3})_{2}$
$C a (O H)_{2} + H_{2} O (l) + 2 C O_{2} (g) \to C a (H C O_{3})_{2}$

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