Chemistrymedium · Past Paper
Which substance is formed when carbon dioxide is passed through lime water for a long time?
ACalcium carbonate
BCalcium hydroxide
CCalcium bicarbonate
DCalcium oxide
✓ Correct Answer: C — Calcium bicarbonate
Excess CO2 dissolves the initial precipitate of calcium carbonate to form soluble calcium bicarbonate [Ca(HCO3)2].
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