Assertion: Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic.
Reason: Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$K_{4} [F e (C N)_{6}] and K_{3} [F e (C N)_{6}]$ Both are low spin complex due to strong ligand field but due to presence of 1 unpaired electron ion in $K_{3} [F e (C N)_{6}]$ , it is paramagnetic.

Crystal field splitting in ferrocyanide is less than ferricyanide ion because higher the oxidation state of metal, greater the crystal field splitting. Hence, the reason is false.

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