Qualitative Analysis - Result Question 11
11. A metal nitrate reacts with $KI$ to give a black precipitate which on addition of excess of $KI$ convert into orange colour solution. The cation of metal nitrate is
(a) $Hg^{2+}$
(b) $Bi^{3+}$
(c) $Sn^{2+}$
(d) $Pb^{2+}$
(2005,1 M)
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Answer:
Correct Answer: 11. (b)
Solution:
$ \mathrm{Bi}^{3+}+3 \mathrm{I}^{-} \longrightarrow \underset{\text { Black }}{\mathrm{BiI}_3 \downarrow} \xrightarrow[\text { excess }]{\mathrm{I}^{-}} \underset{\text { Orange solution }}{[\mathrm{BiI}_4]^-} $
BETA
