Science — AI-generated practice question

Chlor-Alkali Process:

When electricity is passed through an aqueous solution of sodium chloride (brine), it decomposes. This process is called the chlor-alkali process — chlor for chlorine and alkali for sodium hydroxide.

$$2\text{NaCl(aq)} + 2\text{H}_2\text{O(l)} \rightarrow 2\text{NaOH(aq)} + \text{Cl}_2\text{(g)} + \text{H}_2\text{(g)}$$

Products and their uses:

| Product | Where formed | One Use |
|---|---|---|
| Chlorine gas (Cl₂) | At anode | Used for manufacturing bleaching powder; also to disinfect drinking water |
| Hydrogen gas (H₂) | At cathode | Used as a fuel; also in the manufacture of margarine |
| Sodium hydroxide (NaOH) | Near cathode (in solution) | Used in making soap and detergents |

All three products are commercially very important and are obtained from common salt (NaCl).

Source: Chapter 2, Section 2.4.3

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• Examiners expect the balanced equation — don't skip it; it carries marks.
• Name all three products and give a use for each — the question specifically says "all products … one use of each," so missing even one product loses marks.
• Mentioning anode/cathode for Cl₂ and H₂ respectively shows understanding and is expected for full marks.
• The term "brine" for the NaCl solution should be used — it is the textbook term.