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Question

The chemical X is a hydroxide of a divalent metal. On treating this hydroxide with CO2, a milky white precipitate of Y is formed. The precipitate turns to colourless solution by the excess passage of CO2. This colourless solution again gives milky white precipitate 'Y' on heating. Identify X and Y and also give necessary equations.

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Solution

X is Ca(OH)2 and Y is CaCO3
Ca(OH)2CO2CaCO3+H2O (insoluble)
X Y
YCO2−−−ExcessCa(HCO3)2(soluble)

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