Q.

A compound X on heating gives a colourless gas. This residue is dissolved in water to obtain Y. Excess CO2 is bubbled through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The Z is

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a

CaCO3

b

Ca(HCO3)2

c

Na2CO3

d

NaHCO3

answer is B.

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Detailed Solution

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 CaCO3ΔCaO+CO2 CaO+H2O(X)Ca(OH)2 Ca(OH)2+2CO2(Y)CaHCO32(Z)CaHCO32ΔCaCO3+CO2+H2O

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A compound X on heating gives a colourless gas. This residue is dissolved in water to obtain Y. Excess CO2 is bubbled through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The Z is