Which one of the following salts will give a basic solution on dissolving in water ?

Options

A. sodium carbonate
B. sodium chloride
C. sodium sulphate
D. ammonium chloride

Answer

To determine which salt will give a basic solution when dissolved in water, we need to analyze the options based on the nature of the acids and bases that form when the salts dissolve.

### Step-by-Step Solution:

1. **Identify the Nature of Salts**:
- A salt will produce a basic solution if it is formed from a strong base and a weak acid.

2. **Analyze the Options**:
- **Option A: Sodium Carbonate (Na2CO3)**:
- Sodium carbonate is derived from sodium hydroxide (a strong base) and carbonic acid (a weak acid).
- When dissolved in water, it dissociates to form NaOH and H2CO3. Since NaOH is a strong base, the solution will be basic.

- **Option B: Sodium Chloride (NaCl)**:
- Sodium chloride is formed from sodium hydroxide (strong base) and hydrochloric acid (strong acid).
- It will dissolve in water to give a neutral solution because both the acid and base are strong.

- **Option C: Sodium Sulfate (Na2SO4)**:
- Sodium sulfate is formed from sodium hydroxide (strong base) and sulfuric acid (strong acid).
- Like NaCl, it will also produce a neutral solution when dissolved in water.

- **Option D: Ammonium Chloride (NH4Cl)**:
- Ammonium chloride is formed from ammonia (a weak base) and hydrochloric acid (strong acid).
- When dissolved in water, it produces NH4OH (weak base) and HCl (strong acid), resulting in an acidic solution.

3. **Conclusion**:
- Among the options analyzed, only sodium carbonate (Na2CO3) will produce a basic solution when dissolved in water.

### Final Answer:
The salt that will give a basic solution on dissolving in water is **Sodium Carbonate (Na2CO3)**.

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