The oxidation states of Cr in Cr H 2 O 6 Cl 3 ,   Cr C 6 H 6 2 and K 2 Cr CN 2 O 2 O 2 NH 3   ,…

The oxidation states of Cr in CrH2O6Cl3, CrC6H62 and K2CrCN2O2O2NH3 , respectively, are:
  1. +3, 0 and +4
  2. +3, +4 and +6
  3. +3, +2 and +4
  4. +3, 0 and +6

Solution

(i)   CrH2O6Cl3: Hexaaquachromium III chloride

x+6×0+-1×3=0

x=+3

(ii)  CrC6H62:bis η6-benzenechromium 0

y+2×0=0

y=0

(iii)   K2CrCN2O2O2NH3: Potassium amminedicyanido dioxide peroxide chromate VI

2×1+z+2×-1+2×-2+-2+0=0

z=+6

The oxidation states of Cr in CrH2O6Cl3, CrC6H62 and K2CrCN2O2O2NH3, respectively, are +3, 0 and +6.

Asked in: JEE Main 2018 (08 Apr)

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