Zinc carbonate is precipitated from zinc sulphate solution by the addition of:

Options

A. `Na_(2)CO_(3)`
B. `CaCO_(3)`
C. `MgCO_(3)`
D. `NaHCO_(3)`

Answer

To determine which compound can precipitate zinc carbonate from zinc sulfate solution, we can follow these steps:

### Step 1: Identify the reactants
We start with zinc sulfate (ZnSO₄) in an aqueous solution. We need to find a suitable carbonate source that can react with zinc sulfate to form zinc carbonate (ZnCO₃) as a precipitate.

### Step 2: Consider the possible reagents
The options given are:
- A. Na₂CO₃ (Sodium carbonate)
- B. CaCO₃ (Calcium carbonate)
- C. MgCO₃ (Magnesium carbonate)
- D. NaHCO₃ (Sodium bicarbonate)

### Step 3: Analyze the reactivity of the reagents
According to the activity series of metals, magnesium and calcium are more reactive than zinc. Therefore, they cannot displace zinc from its compound. Hence, options B (CaCO₃) and C (MgCO₃) can be eliminated.

### Step 4: Evaluate the remaining options
We are left with:
- A. Na₂CO₃
- D. NaHCO₃

### Step 5: Write the reactions
1. **For Sodium Carbonate (Na₂CO₃)**:
\[ \text{ZnSO}_4 (aq) + \text{Na}_2\text{CO}_3 (aq) \rightarrow \text{ZnCO}_3 (s) + \text{Na}_2\text{SO}_4 (aq) \]
In this reaction, zinc carbonate (ZnCO₃) is formed as a solid precipitate.

2. **For Sodium Bicarbonate (NaHCO₃)**:
\[ \text{ZnSO}_4 (aq) + 2 \text{NaHCO}_3 (aq) \rightarrow \text{ZnCO}_3 (s) + \text{Na}_2\text{SO}_4 (aq) + \text{H}_2\text{O} + \text{CO}_2 (g) \]
Here, zinc carbonate is also formed as a solid precipitate.

### Step 6: Conclusion
Both sodium carbonate (Na₂CO₃) and sodium bicarbonate (NaHCO₃) can precipitate zinc carbonate from zinc sulfate solution. Therefore, the correct answers are A (Na₂CO₃) and D (NaHCO₃).

### Final Answer:
Zinc carbonate is precipitated from zinc sulfate solution by the addition of:
- A. Sodium carbonate (Na₂CO₃)
- D. Sodium bicarbonate (NaHCO₃)

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