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NEET2017Chemistryd and f Block ElementsActual

H g C l 2 and I 2 both when dissolved in water containing I - ions the pair of species formed is:

Options

  1. AH g I 2 , I 3 -
  2. BH g I 4 2 - , I -
  3. CH g I 4 2 - , I 3 -
  4. DH g 2 I 2 , I -

Correct answer

C. H g I 4 2 - , I 3 -

Step-by-step solution

In Solution containing H g C l 2 ,   I 2 and I - , both H g C l 2 and I 2 compete for I - . H ⁡ g ⁡ C ⁡ l ⁡ 2 + 2 I ⁡ - → H ⁡ g ⁡ I ⁡ 2 ↓ + 2 C ⁡ l ⁡ - Red ppt H ⁡ g ⁡ I ⁡ 2 + 2 I ⁡ - → H ⁡ g ⁡ I ⁡ 4 2 - soluble I 2 + I − → I 3 −

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