A metallic nitrate gives black precipitates with $\mathrm{KI}$ solution. On adding excess of $\mathrm{KI}$,…

A metallic nitrate gives black precipitates with $\mathrm{KI}$ solution. On adding excess of $\mathrm{KI}$, an orange-coloured solution is obtained. The ion giving these observations is
  1. $\mathrm{Hg}^{2+}$
  2. $\mathrm{Sn}^{2+}$
  3. $\mathrm{Bi}^{3+}$
  4. $\mathrm{Cd}^{2+}$

Solution

$\mathrm{Bi}^{3+}+\mathrm{KI} ightarrow \mathrm{BiI}_{3} \downarrow \text { Sol. }$
Black
$\mathrm{Bi}\left(\mathrm{NO}_{3}ight)_{3}(\mathrm{aq})+3 \mathrm{KI}(\mathrm{aq}) ightarrow \mathrm{Bi} \mathrm{I}_{3}(\mathrm{~s})+3 \mathrm{KNO}_{3}(\mathrm{aq})$ ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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