Q48 / 150 · MHT CET 2012 · Chemistry
A solution contains $\mathrm{Cl}^{-}, \mathrm{I}^{-}$ and $\mathrm{SO}_{4}^{3-}$ ions in it. Which of the following ion is capable to precipitate all of the above when added in this solution?
- A$\mathrm{Pb}^{2+}$
- Correct answerB$\mathrm{Ba}^{2+}$
- C$\mathrm{Hg}^{2+}$
- D$\mathrm{Cu}^{2+}$
Solution
$\mathrm{Ba}^{2+}$ ion is capable to precipitate $-\mathrm{Cl},-\mathrm{I}$ and $-\mathrm{SO}_{4}^{2-}$ ions.
$\mathrm{Ba}^{2+}+2 \mathrm{Cl}^{-} \longrightarrow \mathrm{BaCl}_{2} \downarrow$
$\mathrm{Ba}^{2+}+2 \mathrm{I}^{-} \longrightarrow \mathrm{BaI}_{2} \downarrow$
$\mathrm{Ba}^{2+}+\mathrm{SO}_{4}^{2-} \longrightarrow \mathrm{BaSO}_{4} \downarrow$
Hence, the correct answer is option: 'B'.