In $K_{4} F e (C N)_{6}$

CN fulfills primary valency

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CN fulfills secondary valency

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K is linked with secondary valency

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K is linked with non-ionic valency

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Solution

The correct option is B
CN fulfills secondary valency

Couple things you need to remember here:
Primary valency : oxidation number
Secondary valency : coordination number

CN fulfills secondary valency

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