A compound 'X' on heating gives a colourless gas. The residue is dissolved in water to obtain 'Y'. E — Qualitative and Quantitative Analysis Chemistry Question
Question
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:
Answer: D
💡 Solution & Explanation
CaCO3 -heat-> CaO (residue) + CO2↑ (colourless gas). CaO + H2O -> Ca(OH)2 ('Y'). Ca(OH)2 + 2CO2 (excess) -> Ca(HCO3)2 ('Z'). Ca(HCO3)2 -heat-> CaCO3 ('X') + CO2 + H2O
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