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A solid compound X on heating gives CO₂ and a residue .

A solid compound X on heating gives CO₂ 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

Options

(a) Ca(HCO₃)₂
(b) CaCO₃
(c) Na₂CO₃
(d) K₂CO₃

Correct Answer:

CaCO₃

Explanation:

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