The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO₂ is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A. The compound A is
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Compound A is CaO
Solution B is Ca(OH)2
C is CaCO3
Solution B is Ca(OH)2
C is CaCO3
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