A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess CO2 is bubbled through an aqueous solution of Y,Z is formed. Z on gently heating gives back X. The compound X is:
A
CaCO3
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B
Na2CO3
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C
Ca(HCO3)2
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D
K2CO3
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Solution
The correct option is ACaCO3 CaCO3Δ−→CaO+CO2XYCaO+H2O→Ca(OH)2+CO2→CaCO3+H2OZ