$H g C l_{2} and I_{2}$ both when dissolved in water containing $I^{-}$ ions the pair of species formed is :

 NEET 2017

H g I_{4}^{2 -}, I_{3}^{-}

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H g C l_{2}, I_{3}^{-}

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H g I_{2}, I^{-}

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

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Solution

The correct option is A $H g I_{4}^{2 -}, I_{3}^{-}$
$I_{2}$ reacts with $I^{-}$ and maintains the following equillibrium.
$I_{2} + I^{-} ⇌ I_{3}^{-}$
$H g^{2 +}$ gives precipitate of $H g I_{2}$ on reaction with $I^{-}$ but $H g I_{2}$ is soluble in solution of $I^{-}$
$H g^{2 +} + 2 I^{-} \to H g I_{2}$
$H g I_{2} + 2 I^{-} ⇌ [H g I_{4}]^{2 -}$
Option (c) is correct

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