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Assertion : Potassium ferrocyanide is di...

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

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

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The correct Answer is:
To solve the question regarding the assertion and reason about potassium ferrocyanide and potassium ferricyanide, we will analyze both statements step by step. ### Step 1: Analyze the Assertion The assertion states that "Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic." - **Potassium Ferrocyanide (K₄[Fe(CN)₆])**: In this compound, iron is in the +2 oxidation state (Fe²⁺). The electron configuration for Fe²⁺ (D6) means that all six electrons can pair up in the 3d orbitals due to the strong field ligand CN⁻. As a result, there are no unpaired electrons, making potassium ferrocyanide **diamagnetic**. - **Potassium Ferricyanide (K₃[Fe(CN)₆])**: Here, iron is in the +3 oxidation state (Fe³⁺). The electron configuration for Fe³⁺ (D5) means that there will be one unpaired electron in the 3d orbitals. This results in potassium ferricyanide being **paramagnetic**. **Conclusion for Step 1**: The assertion is true. ### Step 2: Analyze the Reason The reason states that "Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion." - Crystal field splitting refers to the energy difference between the split d-orbitals in a complex ion. In general, the crystal field splitting is greater for ions in higher oxidation states because they have a greater effective nuclear charge, which pulls the electrons closer and increases the energy difference between the split d-orbitals. - In this case, since Fe³⁺ has a higher oxidation state than Fe²⁺, the crystal field splitting in the ferricyanide ion (Fe³⁺) will be greater than that in the ferrocyanide ion (Fe²⁺). **Conclusion for Step 2**: The reason is false. ### Final Conclusion - The assertion is true, and the reason is false. Therefore, the correct answer is that the assertion is true, but the reason is not.
To solve the question regarding the assertion and reason about potassium ferrocyanide and potassium ferricyanide, we will analyze both statements step by step. ### Step 1: Analyze the Assertion The assertion states that "Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic." - **Potassium Ferrocyanide (K₄[Fe(CN)₆])**: In this compound, iron is in the +2 oxidation state (Fe²⁺). The electron configuration for Fe²⁺ (D6) means that all six electrons can pair up in the 3d orbitals due to the strong field ligand CN⁻. As a result, there are no unpaired electrons, making potassium ferrocyanide **diamagnetic**. - **Potassium Ferricyanide (K₃[Fe(CN)₆])**: Here, iron is in the +3 oxidation state (Fe³⁺). The electron configuration for Fe³⁺ (D5) means that there will be one unpaired electron in the 3d orbitals. This results in potassium ferricyanide being **paramagnetic**. ...
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