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 be used to precipitate zinc carbonate from zinc sulfate solution, we can follow these steps:

### Step 1: Identify the reaction
We need to find a compound that can react with zinc sulfate (ZnSO4) to form zinc carbonate (ZnCO3). The general reaction for precipitation can be written as:
\[ \text{ZnSO}_4 + \text{X} \rightarrow \text{ZnCO}_3 + \text{Y} \]
where X is the compound we are looking for, and Y is another product.

### Step 2: Analyze the options
The options given are:
1. Na2CO3 (Sodium Carbonate)
2. CaCO3 (Calcium Carbonate)
3. MgCO3 (Magnesium Carbonate)
4. NH4HCO3 (Ammonium Bicarbonate)

### Step 3: Check reactivity
We need to consider the reactivity series of metals. Zinc cannot displace a metal that is more reactive than itself. Therefore, we analyze the reactivity of the metals in the options:
- **Na2CO3**: Sodium is more reactive than zinc, but sodium carbonate can still react with zinc sulfate to form zinc carbonate.
- **CaCO3**: Calcium is more reactive than zinc, so it cannot displace zinc from zinc sulfate.
- **MgCO3**: Magnesium is also more reactive than zinc, so it cannot displace zinc from zinc sulfate.
- **NH4HCO3**: Ammonium is less reactive than zinc, and it can react to form zinc carbonate.

### Step 4: Write the balanced equations
For sodium carbonate:
\[ \text{ZnSO}_4 + \text{Na}_2\text{CO}_3 \rightarrow \text{ZnCO}_3 \downarrow + \text{Na}_2\text{SO}_4 \]

For ammonium bicarbonate:
\[ \text{ZnSO}_4 + \text{NH}_4\text{HCO}_3 \rightarrow \text{ZnCO}_3 \downarrow + \text{(NH}_4)_2\text{SO}_4 + \text{H}_2\text{O} + \text{CO}_2 \]

### Step 5: Conclusion
From the analysis, both sodium carbonate (Na2CO3) and ammonium bicarbonate (NH4HCO3) can be used to precipitate zinc carbonate from zinc sulfate solution. However, since the question asks for a single option, the most straightforward answer is:
**Na2CO3 (Sodium Carbonate)**.