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Which one is the most likely structure of CrCl 3 .6H 2 O, if 1/3 of total chlorine of the compound is precipitated by adding AgNO 3 to its aqueous solution?

Options

  1. ACrCl 3 · 6 H 2 O
  2. BCr H 2 O 3 Cl 3 · 3 H 2 O
  3. CCr Cl 2 H 2 O 4 Cl · 2 H 2 O
  4. DCr Cl H 2 O 5 Cl 2 · H 2 O

Correct answer

C. Cr Cl 2 H 2 O 4 Cl · 2 H 2 O

Step-by-step solution

CrCl 3 · 6 H 2 O has 3 − Cl atoms but 1 3 Cl atoms precipitated so one 1 Cl atom get precipitated. According to Werner's theory, only those ions are precipitated which are attached to the metal atoms with ionic bonds and are present outside the co-ordination sphere. Cr H 2 O 4 Cl 2 Cl ( aq ) ⇌ Cr H 2 O 4 Cl 2 + aq + Cl − aq A g + + C l - ⟶ A g C l ↓ w h i t e

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