The correct statements amont I to III are :
(I) Valence bond theory cannot explain the color exhibited by transition metal complexes.
(II) Valance bond theory can predict quantitatively the magnetic properties of transition metal complexes.
(III) Valence bond theory cannot distinguish ligands as weak and strong field ones.
The correct statements amont I to III are :
(I) Valence bond theory cannot explain the color exhibited by transition metal complexes.
(II) Valance bond theory can predict quantitatively the magnetic properties of transition metal complexes.
(III) Valence bond theory cannot distinguish ligands as weak and strong field ones.
(I) Valence bond theory cannot explain the color exhibited by transition metal complexes.
(II) Valance bond theory can predict quantitatively the magnetic properties of transition metal complexes.
(III) Valence bond theory cannot distinguish ligands as weak and strong field ones.
A
(II) and (III) only
B
(I),(II) and (III)
C
(I) and (III) only
D
(I) and (II) only
Text Solution
AI Generated Solution
The correct Answer is:
To solve the question regarding the statements about Valence Bond Theory (VBT) and its limitations in explaining certain properties of transition metal complexes, we will analyze each statement one by one.
### Step 1: Analyze Statement I
**Statement I:** Valence bond theory cannot explain the color exhibited by transition metal complexes.
- **Explanation:** This statement is **true**. The color of transition metal complexes arises from d-d transitions, which are better explained by Crystal Field Theory (CFT) rather than VBT. VBT does not account for the splitting of d-orbitals in the presence of ligands, which is essential for understanding the color.
### Step 2: Analyze Statement II
**Statement II:** Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes.
- **Explanation:** This statement is **false**. While VBT can provide qualitative insights into the magnetic properties, it does not accurately predict the magnetic moments quantitatively. The spin-only formula can be used in some cases, but VBT fails when dealing with more complex interactions like orbital coupling.
### Step 3: Analyze Statement III
**Statement III:** Valence bond theory cannot distinguish ligands as weak and strong field ones.
- **Explanation:** This statement is **true**. VBT does not differentiate between weak field and strong field ligands. This distinction is typically made using CFT, which considers the splitting of d-orbitals based on the nature of the ligands.
### Conclusion
After analyzing all three statements:
- **Statement I:** True
- **Statement II:** False
- **Statement III:** True
Thus, the correct statements among I to III are **I and III only**.
### Final Answer
The correct statements are: **I and III only.**
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