When calcium carbonate reacts with dilute hydrochloric acid, a gas X is formed. When gas X is passed through lime water, it turns milky due to the formation of precipitate Y. So, Y is ____.

Calcium chloride

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Calcium oxide

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Calcium bicarbonate

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Calcium carbonate

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Solution

The correct option is D
Calcium carbonate

Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, water and carbon dioxide gas.

$C a C O_{3} + 2 H C l \to C a C l_{2} + H_{2} O + C O_{2}$

When $C O_{2}$ is passed through lime water, it turns milky due to the formation of white precipitate of calcium carbonate.

$C a (O H)_{2} + C O_{2} \to C a C O_{3} ↓ + H_{2} O$

Suggest Corrections

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on adding $N a H C O_{3}$ to acetic acid, a gas is evolved which turns lime water milky due to the formation of:

C O_{2}

C O_{2}

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