Question

Oxidation number of cr in k3[cr(c2o4)3]

Answer 1

The oxalate ion get 2 electrons

3 oxalate ions get 2 x 3 = 6 electrons

the K atoms donate 3 electrons

So, oxidation state of chromium = +3 + x - 6= 0

I stated 0 here, since the overall charge of the complex is 0

=> x = +6 - 3  = +3

So, oxidation state of chromium is +3

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