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  4. CO2 is passed through lime water. Initially the solution turns milky and then becomes clear upon continued bubbling of CO2. The clear solution is due to the formation of

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Q. $CO_2$ is passed through lime water. Initially the solution turns milky and then becomes clear upon continued bubbling of $CO_2$. The clear solution is due to the formation of

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Solution:

$CO_2$ is passed through lime water which initially turns the solution milky because of formation of calcium carbonate. On continuous bubbling of $CO_2$ the solution becomes clear due to the formation of calcium bicarbonate.
$\underset{\text { Lime water }}{ Ca ( OH )_{2}}+ CO _{2} \rightarrow \underset{\text { (Milky) }}{ CaCO _{3}} \downarrow+ H _{2} O$
$\underset{\text{Excess}}{CaCO _{3}}+ CO _{2}+ H _{2} O \rightarrow \underset{\text{Calcium bicarbonate
(Soluble in water)}}{Ca \left( HCO _{3}\right)_{2}(a q)}$