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Question

Lime water turns milky when carbon dioxide gas is passed through it due to the formation of _________.


A
calcium
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B
calcium dioxide
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C
calcium carbonate
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D
water
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Solution

The correct option is C calcium carbonate

When carbon dioxide passed through lime water it turns milky solution. This is due to the insoluble suspension of calcium carbonate (CaCO3) formed which is 'white' in colour. Calcium carbonate is insoluble in water and settles to the bottom after some time.

The chemical reaction involved is:

Ca(OH)2(aq)+CO2(g)CaCO3(s)+H2O(l)


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