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Question

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 ____.


A

Calcium chloride

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B

Calcium oxide

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C

Calcium bicarbonate

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D

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.

CaCO3+2HClCaCl2+H2O+CO2

When CO2 is passed through lime water, it turns milky due to the formation of white precipitate of calcium carbonate.

Ca(OH)2+CO2CaCO3+H2O


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