s-Block ElementsHard

Question

A compound X on heating gives a colourless gas. The residue is dissolved in water to obtained Y. Excess CO2 is bubbled through aqueous solution of Y, Z is formed. Z on gently heating gives back X. The compound X is: 

Options

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

Solution

CaCO3 → CaO + CO2, CaO + H2O → Ca(OH)2,
X                                                                            Y
Ca(OH)2 + 2CO2 → Ca(HCO3)2, Ca(HCO3)2 →  CaCO3 + H2O + CO2 
                                                Z

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