In the manufacture of sodium hydroxide by product obtained is

Options

A. `O_(2)`
B. `Cl_(2)`
C. `Na_(2)CO_(3)`
D. `NaCl`

Answer

To solve the question regarding the byproduct obtained in the manufacture of sodium hydroxide, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Process**: The primary method for the industrial production of sodium hydroxide (NaOH) is the chloralkali process.

2. **Understand the Raw Material**: The chloralkali process involves the electrolysis of brine, which is a concentrated solution of sodium chloride (NaCl) in water.

3. **Write the Electrolysis Reaction**: When electricity is passed through the brine solution, a chemical reaction occurs. The balanced equation for this reaction is:
\[ 2 \text{NaCl} + 2 \text{H}_2\text{O} \rightarrow 2 \text{NaOH} + \text{Cl}_2 + \text{H}_2 \]
This shows that sodium hydroxide (NaOH) is produced along with chlorine gas (Cl2) and hydrogen gas (H2).

4. **Identify the Byproduct**: From the balanced equation, we can see that the byproducts of this reaction are chlorine gas (Cl2) and hydrogen gas (H2).

5. **Select the Correct Option**: Among the options provided (O2, Cl2, Na2CO3, NaCl), the correct byproduct obtained during the manufacture of sodium hydroxide is chlorine gas (Cl2).

### Final Answer:
The byproduct obtained in the manufacture of sodium hydroxide is **Cl2 (chlorine gas)**.

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