A compound 'X' on heating gives a colourless gas

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Problem

A compound 'X' on heating gives a colourless gas. The residue is dissolved in water to obtain 'Y'. Excess CO2\text{CO}_2 is passed through aqueous solution of 'Y' when 'Z' is formed. 'Z' on gentle heating gives back 'X'. The compound 'X' is: (1) NaHCO3\text{NaHCO}_3 (2) Na2CO3\text{Na}_2\text{CO}_3 (3) Ca(HCO3)2\text{Ca}(\text{HCO}_3)_2 (4) CaCO3\text{CaCO}_3

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