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Question

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 reformed. The compound 'X' is :

A
Ca(HCO3)2
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B
CaCO3
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C
Na2CO3
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D
K2CO3
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Solution

The correct option is C CaCO3
CaCO3 on heating gives CaO and CO2
CaCO3+heatingCaO+CO2.

X is CaCO3 and residue is CaO.
Residue CaO when mixed with water it forms:
CaO+H2OCa(OH)2.

Y is Ca(OH)2.
On passing an excess of CO2 through Ca(OH)2 (Y), it gives
Ca(OH)2+CO2CaCO3+H2O.
On mild heating water will be evaporated, only CaCO3 can be recovered.
Hence option B is correct.

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