Consider the following salts :
Sodium sulphate, Sodium carbonate, Ammonium sulphate
The aqueous solution of which of these salts will:
turn China rose indicator to green ?

Answer

To determine which of the given salts (Sodium Sulphate, Sodium Carbonate, Ammonium Sulphate) will turn the China rose indicator to green, we need to analyze the nature of each salt in an aqueous solution.

### Step-by-Step Solution:

1. **Understanding the China Rose Indicator**:
- The China rose indicator changes color based on the pH of the solution. It turns green in a basic solution.

2. **Identifying the Salts**:
- The salts we are considering are:
- Sodium Sulphate (Na2SO4)
- Sodium Carbonate (Na2CO3)
- Ammonium Sulphate ((NH4)2SO4)

3. **Analyzing Sodium Sulphate (Na2SO4)**:
- Sodium Sulphate is formed from a strong base (NaOH) and a strong acid (H2SO4).
- The reaction of Na2SO4 with water does not produce a basic solution.
- Therefore, Na2SO4 is a neutral salt.

4. **Analyzing Sodium Carbonate (Na2CO3)**:
- Sodium Carbonate is formed from a strong base (NaOH) and a weak acid (H2CO3).
- When dissolved in water, it produces NaOH (strong base) and H2CO3 (weak acid).
- Since it contains a strong base, Na2CO3 will create a basic solution.

5. **Analyzing Ammonium Sulphate ((NH4)2SO4)**:
- Ammonium Sulphate is formed from a weak base (NH4OH) and a strong acid (H2SO4).
- When dissolved in water, it produces NH4OH (weak base) and H2SO4 (strong acid).
- This results in an acidic solution.

6. **Conclusion**:
- Among the three salts, only Sodium Carbonate (Na2CO3) produces a basic solution when dissolved in water.
- Therefore, the aqueous solution of Sodium Carbonate will turn the China rose indicator to green.

### Final Answer:
The aqueous solution of Sodium Carbonate (Na2CO3) will turn the China rose indicator to green.