Which of the following reagents gives a yellow precipitate with a hot faintly acidic solution of ${Bi}^{3 +}$ ions?

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Ammonia solution (excess)

Potassium iodide solution

Freshly prepared 0.125 M alkaline sodium tetrahydroxidostannate (II) solution

Freshly prepared 10% solution of pyrogallol

answer is B.

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Detailed Solution

$\begin{aligned} {Bi}^{3 +} + C_{6} H_{3} ({OH}_{3} ⟶ {Bi}_{6} (C_{6} H_{3} O_{3}) ↓ + 3 H^{+} \\ (Pyrogallol) \begin{array}{c} (Yellow ppt. of \\ bismuth pyrogallate) \end{array} \end{aligned}$

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