A solid compound X on heating gives CO ₂ gas and a residue. The residue mixed with water forms Y. On passing an excess of CO ₂ through Y in water, a clear solution Z is obtained. On boiling Z , compound X is reformed. The compound X is:

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Correct answer: B. CaCO ₃

aligned & CaCO ₃ CaO + CO ₂ & X residue & CaO + H ₂ O Ca ( OH )₂ & Y & Ca ( OH )₂+ CO ₂+ H ₂ O Ca ( HCO ₃ )₂ & Z & Ca ( HCO ₃ )₂ CaCO ₃+ CO ₂ + H ₂ O aligned

A solid compound X on heating gives CO ₂ gas and a residue. The residue mixed with water forms Y. On passing an excess of CO ₂ through Y in water, a clear solution Z is obtained. On boiling Z , compound X is reformed. The compound X is:

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