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NEET levelSingle correct optionDifficulty 1 of 3sb170

Lime water turns milky when carbon dioxide is passed through it for a short time. The milkiness is due to

A $CaO$
B $CaCO X_{3}$
C $Ca (HCO X_{3}) X_{2}$
D $CaCl X_{2}$

Answer: B

Lime water is a solution of

Ca (OH) X_{2}

. A limited amount of

CO X_{2}

gives insoluble calcium carbonate:

Ca (OH) X_{2} + CO X_{2} CaCO X_{3} + H X_{2} O

, which makes it milky.

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