Question

transition metal compounds are often brightly colored what is the oxidation number of the specific element...

transition metal compounds are often brightly colored what is the oxidation number of the specific element in the following compounds?

(a) chromium in Na2CrO4. (yellow)
(b) iron in K3 [Fe (CN)6] (orange)
(c) Cobalt in CoCl2. (blue)
(d) nickel in NiCl2×6 H2O (green)

Homework Answers

Answer #1

a) The oxidation state of Na is +1 and oxidation state of oxygen is -2
   2(1) + x + 4(-2) = 0
   x = +6
   Therefore oxidation number of Chromium in Na2CrO4 is +6
b) The oxidation number of potassium is +1 and CN is -1
   3(1)+ x + 6(-1) = 0
   x = +3
   Therefore oxidation number of Iron in K3[Fe(CN)6] is +3
c) The oxidation number of Cl is -1
   x + 2(-1) = 0
   x= +2
   Therefore the oxidation number of Cobalt in COCl2 is +2
d) The oxidation number of Cl is -1 , H is +1 & O is -2
   x + 2(-1) + 12 (1) + 6 (-2) = 0
   x = +2
   Therefore the oxidation number of Nickel in NiCl2.6H2O is +2
  

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