Match the following mixtures with the respective solution used for this separation :
`{:(,"Column -I",,"Column -II"),((A),H_(2)S,(p),"Decolourises acidified solution of "KMnO_(4)),((B),SO_(2),(q),"Can undergo disproportionation reaction "),((C),HNO_(3),(r),"Can act as reducing agent"),((D),HNO_(2),(s),"V-shaped"),(,,(t),"Acidic nature"):}`

Answer

To solve the matching question, we will analyze each compound in Column I and match it with the appropriate statement in Column II based on its chemical properties.

### Step-by-Step Solution:

1. **Analyzing H₂S (Column A)**:
- **Decolourises acidified solution of KMnO₄ (p)**: H₂S is a reducing agent and can reduce KMnO₄, leading to decolorization. **Match: A - p**.
- **Can undergo disproportionation reaction (q)**: H₂S cannot undergo disproportionation as it is in the lowest oxidation state (-2) and cannot go lower. **Not a match**.
- **Can act as reducing agent (r)**: Yes, H₂S can act as a reducing agent. **Match: A - r**.
- **V-shaped (s)**: The molecular geometry of H₂S is indeed V-shaped. **Match: A - s**.
- **Acidic nature (t)**: H₂S is acidic as it can release H⁺ ions. **Match: A - t**.

2. **Analyzing SO₂ (Column B)**:
- **Decolourises acidified solution of KMnO₄ (p)**: SO₂ can also reduce KMnO₄, leading to decolorization. **Match: B - p**.
- **Can undergo disproportionation reaction (q)**: SO₂ can undergo disproportionation as it can be oxidized to SO₃ and reduced to S. **Match: B - q**.
- **Can act as reducing agent (r)**: SO₂ can act as a reducing agent. **Match: B - r**.
- **V-shaped (s)**: The molecular geometry of SO₂ is V-shaped. **Match: B - s**.
- **Acidic nature (t)**: SO₂ is acidic as it forms sulfurous acid in water. **Match: B - t**.

3. **Analyzing HNO₃ (Column C)**:
- **Decolourises acidified solution of KMnO₄ (p)**: HNO₃ is an oxidizing agent and does not reduce KMnO₄. **Not a match**.
- **Can undergo disproportionation reaction (q)**: HNO₃ does not undergo disproportionation. **Not a match**.
- **Can act as reducing agent (r)**: HNO₃ cannot act as a reducing agent. **Not a match**.
- **V-shaped (s)**: HNO₃ does not have a V-shaped structure; it is trigonal planar. **Not a match**.
- **Acidic nature (t)**: HNO₃ is acidic as it can release H⁺ ions. **Match: C - t**.

4. **Analyzing HNO₂ (Column D)**:
- **Decolourises acidified solution of KMnO₄ (p)**: HNO₂ can reduce KMnO₄, leading to decolorization. **Match: D - p**.
- **Can undergo disproportionation reaction (q)**: HNO₂ can undergo disproportionation as it can be oxidized to HNO₃ and reduced to N₂O. **Match: D - q**.
- **Can act as reducing agent (r)**: HNO₂ can act as a reducing agent. **Match: D - r**.
- **V-shaped (s)**: HNO₂ has a V-shaped structure. **Match: D - s**.
- **Acidic nature (t)**: HNO₂ is acidic as it can release H⁺ ions. **Match: D - t**.

### Final Matches:
- A - p, r, s, t
- B - p, q, r, s, t
- C - t
- D - p, q, r, s, t