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NEET 2017
Exam
NEET
Year
2017
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2017 · Chemistry · d and f Block Elements

HgC l _ 2 and I _ 2 both when dissolved in water containing I ^ -...

HgCl2HgC{l}_{2} and I2{I}_{2} both when dissolved in water containing I−{I}^{-} ions the pair of species formed is:

Options

  1. AHgI2,I3−Hg{I}_{2}, {I}_{3}^{-}
  2. BHgI42−,I−Hg{I}_{4}^{2 -}, {I}^{-}
  3. CHgI42−,I3−Hg{I}_{4}^{2 -}, {I}_{3}^{-}
  4. DHg2I2,I−H{g}_{2}{I}_{2}, {I}^{-}

Correct answer

C. HgI42−,I3−Hg{I}_{4}^{2 -}, {I}_{3}^{-}

Step-by-step solution

In Solution containing HgCl2,I2HgC{l}_{2}, {I}_{2} and I−,{I}^{-}, both HgCl2HgC{l}_{2} and I2{I}_{2} compete for I−.{I}^{-} .

{HgCl2+2I−→HgI2↓+2Cl−Red ppt\begin{cases}H g C {l }_{2} + 2 {I }^{-} & \to & H g {I }_{2} ↓ & + & 2 C {l }^{-} \\ & & \text{Red ppt} & & \end{cases}

{HgI2+2I−→[HgI4]2−soluble\begin{cases}H g {I }_{2} + 2 {I }^{-} & \to & {\left[H g {I }_{4}\right]}^{2 -} \\ & & \text{soluble}\end{cases}

I2+I−→I3−{I}_{2} + {I}^{-} \to {I}_{3}^{-}

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