Assertion (A): ${[Fe (CN)_{6}]}^{3 -}$ is weakly paramagnetic while ${[Fe (CN)_{6}]}^{4 -}$ is diamagnetic.
Reason (R): ${[Fe (CN)_{6}]}^{3 -}$ has +3 oxidation state while ${[Fe (CN)_{6}]}^{4 -}$ has +2 oxidation state..
Select the most appropriate answer from the options given below:

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Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

A is false but R is true.

A is true but R is false.

answer is A.

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Detailed Solution

Oxidation state of Fe in potassium ferricyanide is +2, but in potassium ferrocyanide its oxidation state is +3.

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