`[Cr(NH_(3))_(5)NO_(2)]SO_(4)` and `[Cr(NH_(3))_(5)ONO]SO_(4)` are related to each other as: .

Options

A. Geometrical isomers
B. Linkage ismomers
C. Coordination isomers
D. Ionisation ismers

Answer

To determine the relationship between the two complexes `[Cr(NH₃)₅NO₂]SO₄` and `[Cr(NH₃)₅ONO]SO₄`, we will analyze the ligands and their connectivity to the central metal atom, which in this case is chromium (Cr).

### Step-by-Step Solution:

1. **Identify the Ligands**:
- In the first complex `[Cr(NH₃)₅NO₂]SO₄`, the ligand is NO₂ (nitro).
- In the second complex `[Cr(NH₃)₅ONO]SO₄`, the ligand is ONO (nitrito).

2. **Understand the Nature of Ligands**:
- Both NO₂ and ONO are examples of ambidentate ligands. This means that they can coordinate to the metal through different atoms.
- NO₂ can coordinate through the nitrogen atom (N) or through one of the oxygen atoms (O).
- ONO can coordinate through the oxygen atom (O) or through the nitrogen atom (N).

3. **Connectivity of Ligands**:
- In `[Cr(NH₃)₅NO₂]SO₄`, the NO₂ ligand is bonded through the nitrogen atom, making it a nitro complex.
- In `[Cr(NH₃)₅ONO]SO₄`, the ONO ligand is bonded through one of the oxygen atoms, making it a nitrito complex.

4. **Determine the Type of Isomerism**:
- Since the two complexes differ in the connectivity of the ligands (the way the ligands are attached to the central metal atom), they exhibit linkage isomerism.
- Linkage isomerism occurs when a ligand can attach to the metal in more than one way, leading to different structural isomers.

5. **Conclusion**:
- The complexes `[Cr(NH₃)₅NO₂]SO₄` and `[Cr(NH₃)₅ONO]SO₄` are related to each other as linkage isomers due to the different ways the ambidentate ligand (NO₂/ONO) is coordinated to the chromium center.

### Final Answer:
The complexes `[Cr(NH₃)₅NO₂]SO₄` and `[Cr(NH₃)₅ONO]SO₄` are related to each other as linkage isomers.