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Q.

When CO2  gas is passed through lime water, it turns milky, Which of the following compounds is responsible for this milkiness ?

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a

Sodium carbonate

b

Calcium carbonate

c

Calcium chloride

d

Calcium oxide

answer is D.

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Detailed Solution

When carbon dioxide gas is passed through calcium hydroxide or lime water, it reacts with the water to form Carbonic acid(H2CO3) first. This carbonic acid then reacts with Calcium hydroxide and forms Calcium carbonate, which is responsible for the milkiness.

 H2CO3+Ca(OH)2 → CaCO3+2H2O
 

 

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