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RRB NTPC Prelims Model Paper 5 with solutions

Question : 61 of 100

Marks: +1, -0

Lime water turns milky due to the formation of:

Solution:

(1) Lime water turns milky due to reaction of CaO with

CO_2

forming

CaCO_3. CaCO_3

is insoluble in lime water and precipitates. But this milkiness disappears after we pass excess of

CO_2

since calcium hydrogen carbonate

[Ca(HCO_3)_2]

is formed which is soluble in lime water.

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