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Question:

The Oxidation states of Cr in [Cr(H₂O)₆]Cl₃, [Cr(C₆H₆)₂], and K₂[Cr(CN)₂(O)₂(O₂)(NH₃)] respectively are?

+3,0and+4

+3,+4and+6

+3,0and+6

+3,+2and+4

Solution:

The Oxidation states of Cr let be x in

  1. [Cr(H₂O)₆]Cl₃
    x + 6 × 0 + 3 × (-1) = 0
    x = +3
  2. [Cr(C₆H₆)₂]
    x + 2 × 0 = 0
    x = 0
  3. K₂[Cr(CN)₂(O)₂(O₂)(NH₃)]
    2 × (+1) + x + 2 × (-1) + 2 × (-2) + 2 × (-1) + 0 = 0
    x = +6
    Therefore option C is correct.