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What is the sum of the oxidation number of cobalt in [Co(H2O)(CN)(en)2]^2+and [CoBr2(en)2]^+?

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What is the sum of the oxidation number of cobalt in [Co(H2O)(CN)(en)2]^2+and [CoBr2(en)2]^+?

(a) +3

(b) +4

(c) +5

(d) +6

The question was posed to me in unit test.

My doubt is from Werner’s Theory of Coordination Compounds topic in portion Coordination Compounds of Chemistry – Class 12

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The correct option is (d) +6

Best explanation: In [Co(H2O)(CN)(en)2]^2+, the overall charge is +2 and 0, -1 and 0 on H2O, CN and en groups respectively. If ‘x’ is the oxidation number of Co, then (x + 0 – 1 + 0 = +2), which implies x=+3. Similarly, in [CoBr2(en)2]^+, the charge on Br is -1, so if ‘y’ is the oxidation number of Co, then (y – 2 + 0 = +1), which implies y=+3. Therefore, the sum of the oxidation numbers is 3 + 3 = 6.

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