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How to find the oxidation state of Cobalt and chromium in [Co(NH 3 ) 6 ][Cr(CN) 6 ]?

How to find the oxidation state of Cobalt and chromium in  [Co(NH3)6][Cr(CN)6]?

Grade:12

2 Answers

Arun
25750 Points
4 years ago
as the complex [Cr(CN)6]is an anion Chromium has a tendency to show +3 oxidation state .So the charge on anionic complex is -3 
as the whole compound is neutral , the cationic complex carries a +3 charge 
As there are 2 chlorine molecules in the cationic compound , the oxidation of cobalt must be +5 which is hardly possible
Vikas TU
14149 Points
4 years ago
Dear student 
Let oxidation no of Cr = x
3 + x + 8 * ( -2 ) = 0
3 + x - 16 = 0
x = +13
but chromium can have the max of only +5 oxidation state. This contrary is solved by the bonding pattern as shown in structure .The Cr is attached to only 5 oxygen through single bond hence oxidation state is +5

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