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Coordination and Oxidation Number

Specify the o...

Question

Specify the oxidation numbers of the metals in the following coordination entities:
(i) $[C o (H_{2} O) (C N) (e n)_{2}]^{2 +}$ (ii) $[C o B r_{2} (e n)_{2}]^{+}$ (iii) $[P t C l_{4}]^{2 -}$ (iv) $K_{3} [F e (C N)_{6}]$ (v) $[C r (N H_{3})_{3} C l_{3}]$

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Solution

Let X be the oxidation number of metal in the complex.
(i) $X + 0 + (- 1) + 2 (0) = + 2 X = + 3$
(ii) $X + 2 (- 1) + 2 (0) = + 1 X = + 3$
(iii) $X + 4 (- 1) = - 2 X = + 2$
(iv) $3 (+ 1) + X + 6 (- 1) = 0 X = + 3$
(v) $X + 3 (0) + 3 (- 1) = 0 X = + 3$

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