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When carbon dioxide is passed through lime water, the solution turns milky, but, on prolonged passage, the solution turns clear. This is because

General Knowledge 2014 CDS General Knowledge 2014 CDS 2014

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the calcium carbonate formed initially is converted to soluble calcium bicarbonate on passage of more carbon dioxide

the reaction is reversible and lime water is regenerated

the calcium bicarbonate formed initially is converted to soluble calcium carbonate on passage of more carbon dioxide

the initially formed insoluble compound is soluble in carbonic acid