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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] straightforward exam-ready
The process of electrolysis of brine produces three useful products. Which of the following is NOT one of them? (A) Sodium hydroxide (B) Chlorine (C) Hydrogen (D) Oxygen
  1. A Sodium hydroxide
  2. B Chlorine
  3. C Hydrogen
  4. D Oxygen
Generated by claude-sonnet-4-6 · 2026-06-26 01:03 · grounding rag
Model Answer

(D) Oxygen

Electrolysis of brine (chlor-alkali process) produces sodium hydroxide (NaOH), chlorine (Cl₂), and hydrogen (H₂). Oxygen is not produced in this process.

Explanation

The textbook (Chapter 2, Section 2.4.3) clearly states the chlor-alkali process equation:
$$2\text{NaCl(aq)} + 2\text{H}_2\text{O(l)} \rightarrow 2\text{NaOH(aq)} + \text{Cl}_2\text{(g)} + \text{H}_2\text{(g)}$$
Only three products are formed — NaOH, Cl₂, and H₂. Oxygen does not appear. Students often confuse this with electrolysis of water (which gives H₂ and O₂). Remember: brine electrolysis → chlor-alkali process → no oxygen produced.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.