Name the processes from which chlorine is obtained as a by-product. What will happen if an aqueous solution of NaCl is subjected to electrolysis?

Explanation

### Step-by-Step Solution:

1. **Identify the Process for Chlorine Production:**
- The process from which chlorine is obtained as a by-product is known as **Down's process**. This process involves the electrolysis of molten sodium chloride (NaCl).

2. **Electrolysis of Aqueous NaCl:**
- When an aqueous solution of NaCl (commonly referred to as brine) is subjected to electrolysis, the following reactions occur:
- At the **anode** (positive electrode), chloride ions (Cl⁻) are oxidized to form chlorine gas (Cl₂):
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