Question

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)

Answer #1

2(1) + x + 4(-2) = 0

x = +6

Therefore oxidation number of Chromium in
Na_{2}CrO_{4} 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
K_{3}[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
COCl_{2} 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
NiCl_{2}.6H_{2}O is +2

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