Statement–1 : The magnitude of for a given ligand increases as the charge on he metal ion increases.Statement–2 : NH3 is a weak field ligand towards Co2+ but acts as a strong field ligand towards Co3+.a)Statement- 1 is True, Statement- 2 is True; Statement- 2 is a correct explanationfor Statement- 1.b)Statement- 1 is True, Statement- 2 is True; Statement- 2 is NOT a correct explanationfor Statement 1.c)Statement- 1 is True, Statement- 2 is False.d)Statement- 1 is False, Statement- 2 is True.Correct answer is option 'B'. Can you explain this answer?

Question

Statement&#8211;1 : The magnitude of for a given ligand increases as the charge on he metal ion increases.Statement&#8211;2 : NH3 is a weak field ligand towards Co2+ but acts as a strong field ligand towards Co3+.a)Statement- 1 is True, Statement- 2 is True; Statement- 2 is a correct explanationfor Statement- 1.b)Statement- 1 is True, Statement- 2 is True; Statement- 2 is NOT a correct explanationfor Statement 1.c)Statement- 1 is True, Statement- 2 is False.d)Statement- 1 is False, Statement- 2 is True.Correct answer is option 'B'. Can you explain this answer?

Answer

Explanation:

Statement 1:
- The magnitude of Δo for a given ligand increases as the charge on the metal ion increases. This is because as the charge on the metal ion increases, the electrostatic forces between the metal ion and the ligands become stronger, leading to a larger splitting of d orbitals. This results in a higher crystal field stabilization energy (CFSE) and a greater Δo value.

Statement 2:
- NH3 is a weak field ligand towards Co2+ but acts as a strong field ligand towards Co3+. This is because the charge on the metal ion affects the type of bonding that occurs between the metal ion and the ligand. In the case of Co2+, NH3 forms weak bonds due to the lower charge, resulting in a smaller Δo value. However, with Co3+, NH3 forms stronger bonds due to the higher charge, leading to a larger Δo value.

Therefore, Statement 1 is true as the charge on the metal ion indeed affects the magnitude of Δo, and Statement 2 is true as NH3 exhibits different bonding behaviors towards Co2+ and Co3+ based on the charge of the metal ion. However, Statement 2 is not a correct explanation for Statement 1 as it does not directly explain why the magnitude of Δo increases with the charge on the metal ion.

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