A compound 'x' on heating gives a colourless gas. The residue is dissolved in water to obtain 'y'. Excess co2 is passed through aqueous solution of 'y', when 'z' is formed. 'z', on gentle heating, gives back 'x'. The compound 'x' is
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Explanation:
The compound 'X' is CaCO3 (Calcium Carbonate).....
Eqn(on heating this), CaCO3------> CaO+CO2
CO2 is the colourless gas, and CaO is the residue....
When the residue is mixed with water,
CaO+H2O-> Ca(OH)2------------> 'Y' (Calcium Hydroxide)
When excess amt of CO2 is passes through 'Y',
Ca(OH)2+CO2-> Ca(HCO3)2.....'Z'(Calcium hydrogen carbonate)
On heating 'Z',
Ca(HCO3)2-> CaO+H2O+CO2........
It gives back 'X'.................
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