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Magnetic Properties

How to find o...

Question

How to find oxidation number of Fe in Na₄[Fe(CN)6]?

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Solution

Na⁴⁺ imparts a -4 charge outside the complex entity to allow neutrality of compound.
CN has an oxidation state of -1.So CN₆ has oxidation state of -6. So for -4 to appear outside, the oxidation state of Fe must be +2.
-6+x=-4
x=-4+6=2

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