T.B. Q.4. C.
Why Limewater turns milky when $C O_{2}$ is passed through it?

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Solution

Limewater traditionally means a weak solution of the alkali calcium hydroxide $C a {(O H)}_{2}$ .

When $C O_{2}$ is passed through limewater, it reacts with calcium hydroxide to form insoluble particulates (precipitate) of Calcium carbonate $(C a C O_{3}) .$

Calcium carbonate is weak basic salt and this gives a milky white precipitate.

Hence, lime water turns milky when $C O_{2}$ gas is passed through it.

$C a {(O H)}_{2} (a q) + C O_{2} (g) \to C a C O_{3} ⏐ ↓ + H_{2} O (l)$

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