Metallurgical Operations, Hydrogen and its Compounds (Quiz)

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Q.1 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 
  Ca(HCO3)2
  CaCO3
  Na2CO3
  K2CO3