AIPMT MAINS 2010 Chemistry Carbonates and Bicarbonates MCQ Question
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 is
CaCO₃
Na₂CO₃
K₂CO₃
CaSO₄.2H₂O
Correct Answer
Detailed Explanation
CaCO₃ decomposes to CaO and CO₂. CaO forms Ca(OH)₂ in water, which reacts with CO₂ to form CaCO₃ again.
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