Solvay process is used for the manufacture of

Options

A. Sodium metal
B. Washing soda
C. Bleaching powder
D. Quick lime

Answer

### Step-by-Step Solution:

1. **Understanding the Solvay Process**: The Solvay process is an industrial method used primarily for the production of sodium carbonate (soda ash), which is commonly known as washing soda.

2. **Raw Materials**: The main raw materials used in the Solvay process are:
- Calcium Carbonate (CaCO₃)
- Ammonia (NH₃)
- Sodium Chloride (NaCl)

3. **Decomposition of Calcium Carbonate**: The first step in the process involves heating calcium carbonate. When heated, calcium carbonate decomposes into calcium oxide (CaO) and carbon dioxide (CO₂):
\[ \text{CaCO}_3 \xrightarrow{\text{heat}} \text{CaO} + \text{CO}_2 \]

4. **Formation of Ammonium Carbonate**: The carbon dioxide produced is then reacted with ammonia and water to form ammonium carbonate:
\[ \text{NH}_3 + \text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{(NH}_4)_2\text{CO}_3 \]

5. **Formation of Ammonium Bicarbonate**: The ammonium carbonate is further reacted with excess carbon dioxide and water to produce ammonium bicarbonate:
\[ \text{(NH}_4)_2\text{CO}_3 + \text{CO}_2 + \text{H}_2\text{O} \rightarrow 2 \text{NH}_4\text{HCO}_3 \]

6. **Reaction with Sodium Chloride**: The ammonium bicarbonate is then reacted with sodium chloride. This reaction produces sodium hydrogen carbonate (baking soda) and ammonium chloride:
\[ \text{NH}_4\text{HCO}_3 + \text{NaCl} \rightarrow \text{NaHCO}_3 + \text{NH}_4\text{Cl} \]

7. **Formation of Sodium Carbonate**: The sodium hydrogen carbonate is then heated to produce sodium carbonate, carbon dioxide, and water:
\[ \text{NaHCO}_3 \xrightarrow{\text{heat}} \text{Na}_2\text{CO}_3 + \text{CO}_2 + \text{H}_2\text{O} \]

8. **Conclusion**: The final product of the Solvay process is sodium carbonate, also known as washing soda.

### Final Answer:
The Solvay process is used for the manufacture of **Washing Soda** (sodium carbonate).

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