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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 B CaCO3
CaCO3XCaOresidue+CO2;CaO+H2OCa(OH)2YCa(OH)2Y+2CO2Ca(HCO3)2;ZCa(HCO3)2ZboilingCaCO3X+H2O+CO2

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