Which of the following reaction is not a part of solvay's process for preparation of sodium carbonate?

Options

A. `2NH_(3)+H_(2)O+CO_(2)to(NH_(4))_(2)CO_(3)`
B. `(NH_(4))_(2)CO_(3)+H_(2)O+CO_(2)to2NH_(4)HCO_(3)`
C. `2NH_(4)HCO_(3)to(NH_(4))_(2)CO_(3)+H_(2)O+CO_(2)`
D. `NH_(4)HCO_(3)+NaCl toNH_(4)Cl+NaHCO_(3)`

Explanation

To determine which reaction is not a part of the Solvay process for the preparation of sodium carbonate, we will first outline the key reactions involved in the Solvay process.

### Step-by-step Solution:

1. **Understanding the Solvay Process**:
- The Solvay process is primarily used for the production of sodium carbonate (Na2CO3), commonly known as washing soda.

2. **Initial Reaction**:
- The process begins with the thermal decomposition of calcium carbonate (CaCO3), which is obtained from limestone:
\[ \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \]

3. **Formation of Ammonium Bicarbonate**:
- The carbon dioxide (CO2) produced reacts with ammonia (NH3) and water (H2O) to form ammonium bicarbonate (NH4HCO3):
\[ \text{CO}_2 + \text{NH}_3 + \text{H}_2\text{O} \rightarrow \text{NH}_4\text{HCO}_3 \]

4. **Reaction with Brine**:
- Ammonium bicarbonate then reacts with sodium chloride (NaCl) from brine to produce sodium bicarbonate (NaHCO3) and ammonium chloride (NH4Cl):
\[ \text{NH}_4\text{HCO}_3 + \text{NaCl} \rightarrow \text{NaHCO}_3 + \text{NH}_4\text{Cl} \]

5. **Precipitation of Sodium Bicarbonate**:
- Sodium bicarbonate is insoluble in water and precipitates out of the solution.

6. **Decomposition of Sodium Bicarbonate**:
- The precipitated sodium bicarbonate is then heated to produce sodium carbonate, water, and carbon dioxide:
\[ 2 \text{NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_2 \]

7. **Identifying the Reaction Not Part of the Process**:
- Among the reactions listed, we need to identify which one does not belong to the Solvay process. The reaction:
\[ \text{NH}_4\text{HCO}_3 \rightarrow \text{(NH}_4\text{)}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_2 \]
is not part of the Solvay process. This reaction suggests the formation of ammonium carbonate, which is not involved in the production of sodium carbonate through the Solvay method.

### Conclusion:
The reaction that is not a part of the Solvay process for the preparation of sodium carbonate is:
\[ \text{NH}_4\text{HCO}_3 \rightarrow \text{(NH}_4\text{)}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_2 \]