A compound X on heating gives a colourless gas. The residue is dissolved in water to obtained Y. Excess CO2

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:

(A) CaCO₃

(B) Na₂CO₃

(D) K₂CO₃

A compound X on heating gives a colourless gas. The residue is dissolved in water to obtained Y. Excess CO2

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