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Properties of CO2

A substance X...

Question

A substance X is used as a building material and is insoluble in water. when reacted with DIL. HCl it produces a gas which turns lime water milky ,predict the substance. write the chemical reaction involved?

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Solution

Substance X is limestone.
Chemical formula- CaCO₃
Insoluble in water, used as building material (cement).
Reaction with HCl-
CaCO₃ + 2HCl $\to$ CaCl₂ + CO₂ + H₂O
Gas produced which turn lime water milky is carbon dioxide-
Ca(OH)₂+ CO₂ $\to$ CaCO₃(s) + H₂O

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