Select the correct combination –

Options

A. The aqueous solutions of each `Na_3BO_3 and Na_3PO_4` – Acidic nature
B. The aqueous solutions of each `Na_3BO_3 and CH_3COONa` – Basic nature
C. The aqueous solutions of each `CH_3COONa and NaCN` – Acidic nature
D. The aqueous solutions of each `Na_3PO_4 and NH_4Cl` – Acidic nature

Answer

To solve the question regarding the nature of the combinations of salts in aqueous solutions, we will analyze each salt provided in the options and determine whether they produce acidic, basic, or neutral solutions.

### Step-by-Step Solution:

1. **Identify the Salts and Their Ions:**
- For **Na3BO3**:
- Dissociates into Na⁺ and BO3³⁻ ions.
- BO3³⁻ can react with water to produce H3BO3 (boric acid) and OH⁻ ions.
- NaOH is a strong base and H3BO3 is a weak acid.

2. **Determine the Nature of Na3BO3:**
- The combination of a strong base (NaOH) and a weak acid (H3BO3) results in a basic solution.

3. **Analyze the Second Salt Na3PO4:**
- Dissociates into Na⁺ and PO4³⁻ ions.
- PO4³⁻ can react with water to produce H3PO4 (phosphoric acid) and OH⁻ ions.
- NaOH is a strong base and H3PO4 is a weak acid.

4. **Determine the Nature of Na3PO4:**
- Again, the combination of a strong base (NaOH) and a weak acid (H3PO4) results in a basic solution.

5. **Consider the Salt CH3COONa:**
- Dissociates into CH3COO⁻ and Na⁺ ions.
- CH3COO⁻ can react with water to produce CH3COOH (acetic acid) and OH⁻ ions.
- CH3COOH is a weak acid.

6. **Determine the Nature of CH3COONa:**
- The combination of a strong base (NaOH) and a weak acid (CH3COOH) results in a basic solution.

7. **Evaluate NaCN:**
- Dissociates into Na⁺ and CN⁻ ions.
- CN⁻ can react with water to produce HCN (hydrogen cyanide) and OH⁻ ions.
- HCN is a weak acid.

8. **Determine the Nature of NaCN:**
- The combination of a strong base (NaOH) and a weak acid (HCN) results in a basic solution.

9. **Analyze NH4Cl:**
- Dissociates into NH4⁺ and Cl⁻ ions.
- NH4⁺ can react with water to produce NH4OH (ammonium hydroxide) and H⁺ ions.
- HCl is a strong acid and NH4OH is a weak base.

10. **Determine the Nature of NH4Cl:**
- The combination of a strong acid (HCl) and a weak base (NH4OH) results in an acidic solution.

11. **Final Combination Analysis:**
- The combination of Na3PO4 (basic) and NH4Cl (acidic) results in a solution that is neither purely acidic nor purely basic, thus indicating a neutral nature.

### Conclusion:
The correct combination that shows the nature of the salts is **Option 2: Na3PO4 and CH3COONa**, as both produce basic solutions.