Consider the following salts :
Sodium sulphate, Sodium carbonate, Ammonium sulphate
The aqueous solution of which of these salts will:
have no effect on any indicator ?

Answer

To determine which of the given salts (sodium sulfate, sodium carbonate, or ammonium sulfate) has an aqueous solution that will have no effect on any indicator, we need to analyze the nature of each salt in terms of acidity and basicity.

### Step-by-Step Solution:

1. **Identify the Salts**: The salts given are:
- Sodium sulfate (Na2SO4)
- Sodium carbonate (Na2CO3)
- Ammonium sulfate ((NH4)2SO4)

2. **Determine the Nature of Each Salt**:
- **Sodium Sulfate (Na2SO4)**:
- Sodium sulfate is formed from sodium hydroxide (a strong base) and sulfuric acid (a strong acid).
- Since it is derived from a strong acid and a strong base, it is classified as a neutral salt.

- **Sodium Carbonate (Na2CO3)**:
- Sodium carbonate is formed from sodium hydroxide (a strong base) and carbonic acid (H2CO3), which is a weak acid.
- Since it is derived from a strong base and a weak acid, it is classified as a basic salt.

- **Ammonium Sulfate ((NH4)2SO4)**:
- Ammonium sulfate is formed from ammonium hydroxide (NH4OH, a weak base) and sulfuric acid (a strong acid).
- Since it is derived from a weak base and a strong acid, it is classified as an acidic salt.

3. **Conclusion**:
- The only salt that is neutral and will have no effect on any indicator is **Sodium Sulfate (Na2SO4)**.

### Final Answer:
The aqueous solution of **Sodium Sulfate (Na2SO4)** will have no effect on any indicator.

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