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Q.

A solid compound 'X' on heating gives CO2  gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of CO2  through Y in water, a clear solution 'Z' is obtained. On boiling 'Z' compound 'X' is formed. The compound 'X' is                      

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a

Na2CO3

b

CaCO3

c

K2CO3

d

Ca(HCO3)2

answer is B.

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Detailed Solution

CaCO3CaO+CO2

CaO+H2OCa(OH)2

Ca(OH)2+CO2CaCO3+H2O

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