AIIMS 2019 Chemistry Magnetic Properties MCQ Question
Assertion : Potassium ferricyanide, is diamagnetic, while potassium ferrocyanide is paramagnetic.Reason : Oxidation state of in potassium ferricyanide is +2, but in potassium ferrocyanide its oxidation state is +3.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If assertion is true but reason is false.
Correct Answer
Detailed Explanation
The statement regarding K₃[Fe(CN)₆] being slightly paramagnetic due to its oxidation state (O.S.) of +3 is accurate, as it contains unpaired electrons in the d-orbitals of Fe³⁺. However, the assertion about K₄[Fe(CN)₆] being diamagnetic with an O.S. of +2 is misleading because it does not account for the electronic configuration of the iron ion in this complex, which is actually Fe²⁺ and can exhibit unpaired electrons depending on the ligand field. Therefore, the overall characterization of both complexes is not entirely correct, leading to the conclusion that option D is appropriate. Options A and B are incorrect as they oversimplify the magnetic properties of these complexes, while option C is not applicable since the information provided allows for a definitive assessment.
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