Question

When carbon dioxide gas is passed through lime water,

• A. calcium hydroxide is formed.
• B. white precipitate of CaO is formed.
• C. white precipitate of $CaC{O}_3$ is formed.
• D. colour of lime water disappears.

Answer 1

The correct option is C

white precipitate of $CaC{O}_3$ is formed.

When $C{O}_2$ is passed through lime water $Ca(OH{)}_2$, a white precipitate of $CaC{O}_3$ is formed, which turns lime water milky.
$Ca\left(OH{)}_2\right(aq)+C{O}_2(g)\to CaC{O}_3\downarrow +H_{2}O(l)$