Which of the following changes occur when an excess of `CO_(2)(g)` is passed into a clear solution of limewater ?A. A white precipitate of `CaCO_(3)` is formed.B. A white precipitate of `CaCO_(3)` is formed initially which changes into soluble `CA(HCO_(3))_(2)` on passing excess `CO_(2)` gas.C. A white precipitate of `Ca(HCO_(3))_(2)` is formed.D. A white precipitate of both `CaCO_(3) "and" Ca(HCO_(3))_(2)` is formed.

Which of the following changes occur when an excess of `CO_(2)(g)` is

1.	Which of the following changes occur when an excess of `CO_(2)(g)` is passed into a clear solution of limewater ?A. A white precipitate of `CaCO_(3)` is formed.B. A white precipitate of `CaCO_(3)` is formed initially which changes into soluble `CA(HCO_(3))_(2)` on passing excess `CO_(2)` gas.C. A white precipitate of `Ca(HCO_(3))_(2)` is formed.D. A white precipitate of both `CaCO_(3) "and" Ca(HCO_(3))_(2)` is formed.
Answer» Correct Answer - B When `CO_(2)(g)` is passed through lime water, it turns milky due to the formation of insoluble calcium carbonate: `Ca(OH)_(2)+CO_(2)toCaCO_(3)^(-)+H_(2)O` On passing excess of `CO_(2)(g)` the precipitate of `CaCO_(3)` dissolves to form soluble calcium bicarbonate. Hence the milkiness disappears. `CaCO_(3)+CO_(2)+H_(2)Otounderset("soluble")(Ca(HCO_(3))_(2))` If this clear solution of `Ca(HCO_(3))_(2)` is heated, the solution again turns milky due to te decomposition of calcium bicarbonate bakc to calcium carbonate: `Ca(HCO_(3))_(2)overset(Delta)toCaCO_(3)darr+CO_(2)+H_(2)O`

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