First slide

Chemical properties

Question

${HgCl}_{2}$ and $I_{2}$ both when dissolved in water containing $I^{-}$ ions, the pair of species formed is

Moderate

A

${HgI}_{2}, I^{-}$
B

${HgI}_{4}^{2 -}, I_{3}^{-}$
C

$H g_{2} I_{2}, I^{-}$
D

${HgI}_{2}, I_{3}^{-}$

Solution

${HgCl}_{2} + 4 I_{(aq)}^{-} ⟶ {HgI}_{4 (aq)}^{2 -} + 2 {Cl}_{(aq)}^{-}$
$I_{2 (s)} + I_{(a q)}^{-} ⟶ I_{3 (a q)}^{-}$

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