A: `[Cr (H_(2)O)_(6)]^(3+)` is Inner orbital complex.
R: `H_(2)O` is strong ligand generally

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. ) If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states that `[Cr(H₂O)₆]^(3+)` is an inner orbital complex.

1. **Determine the oxidation state of chromium (Cr)**:
- Let the oxidation state of Cr be \( x \).
- The overall charge of the complex is \( +3 \).
- Each water molecule is neutral, contributing \( 0 \).
- Therefore, we have:
\[ x + 6(0) = +3 \implies x = +3 \]

2. **Determine the electron configuration of chromium in the +3 oxidation state**:
- The atomic number of chromium is 24, with the electron configuration of \( [Ar] 3d^5 4s^1 \).
- In the +3 oxidation state, two electrons are removed from the 3d and 4s orbitals:
\[ [Ar] 3d^3 4s^0 \]

3. **Identify the hybridization**:
- In the presence of 6 water ligands, which are neutral and can donate lone pairs, we can determine the hybridization.
- The hybridization involving the 3d orbitals (inner d orbitals) and the 4s and 4p orbitals leads to:
\[ \text{Hybridization: } d^2sp^3 \]
- Since the 3d orbitals are involved, this confirms that it is indeed an inner orbital complex.

### Conclusion for Assertion:
- The assertion is **true** because `[Cr(H₂O)₆]^(3+)` is an inner orbital complex.

### Step 2: Analyze the Reason
The reason states that \( H₂O \) is a strong ligand generally.

1. **Identify the nature of \( H₂O \) as a ligand**:
- Water (\( H₂O \)) is generally classified as a **weak field ligand**.
- In crystal field theory, weak field ligands do not cause significant splitting of the d-orbitals and do not favor electron pairing.

### Conclusion for Reason:
- The reason is **false** because \( H₂O \) is a weak field ligand, not a strong one.

### Final Conclusion:
- The assertion is true, and the reason is false. Therefore, the correct option is that the assertion is true but the reason is false.

### Answer:
The correct option is **3**: Assertion is true, Reason is false.

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