UPSC CDS Science Chemistry Questions Part 1

Question : 84 of 100

Marks: +1, -0

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

[2014 CDS-II]

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

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