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What is the change in oxidation number o...

What is the change in oxidation number of the encircled element in the following `[Fe (CN)_6]^(4-)rarr[Fe (CN)_6]^(3-)`.

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[Fe(CN)_6]^(4-) ion is:

The oxidation number of Fe in K_4[Fe(CN)_6] is :

Oxdation number of Fe in K_3[Fe(CN)_6] is:

What is the oxidation number of iron in [Fe(CN)_6]^(3-) is ?.

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