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Q.

Lime water turns milky when which one of the following gas is passed through it?

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a

H_{2}

b

CO

c

C O_{2}

d

S O_{2}

answer is C.

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Detailed Solution

concept - Lime water is a calcium hydroxide (

Ca(OH) 2

) saturated solution. "Pure" limewater is clear and colourless, with a slight earthy odour and bitter taste. It is alkaline in nature with a pH of 12.4.
Lime water can be prepared by mixing calcium hydroxide (

Ca(OH) 2

) with water and removing the excess suspended solids (e.g. by filtration) as it is not completely soluble in water.
Now, Calcium hydroxide reacts with carbon dioxide to form the precipitate of calcium carbonate and water.
Thus, lime water turns milky due to the formation of an insoluble suspension of calcium carbonate.
The reaction is:

Ca {(OH)}_{2} + C O_{2} \to CaC O_{3} + H_{2} O

Hence, the correct option is (3).

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