Question

Name a gas (other than $C{O}_2$) which turns lime water milky?

Answer 1

Concept used: chemical process

The gas which turns lime water milky (other than $C{O}_2$) is Sulphur dioxide $\left(S{O}_2\right)$.

$\mathrm{Ca}(\mathrm{OH}{)}_2\left(\mathrm{aq}\right)+{\mathrm{SO}}_2\left(\mathrm{s}\right)\to {\mathrm{CaSO}}_3\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

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Hence, other than $C{O}_2$_, Sulphur dioxide also turns lime water milky.