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Rishita summarizes the… (Class 10 Science SQP 2026-27, Q18)

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ScienceCBSE Class 10 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2026-27: question 18

From the official CBSE sample question paper for 2026-27, section B, question 18, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q18 · 1 mark · MCQCompetency-basedAcids, Bases and Salts

Rishita summarizes the chlor-alkali process in the following table. Identify the options that are correctly matched. Table columns: Option | Product | Formed | Use. I | Hydrogen | At cathode | Used as a fuel. II | Chlorine | At anode | Used to make margarines. III | Sodium Hydroxide | Near cathode | To make soap. IV | Sodium Hydroxide | Near anode | To make bleaching powder.

  1. (A)I, II and III
  2. (B)I and III
  3. (C)II and IV
  4. (D)I, II, III and IV

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

Open one hint at a time and try again before the next.

Hint 1

Write which product forms at each electrode in the electrolysis of brine.

Hint 2

Which product is used to hydrogenate oils into margarine?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. In the chlor-alkali process: . Chlorine forms at the anode, hydrogen at the cathode, and sodium hydroxide near the cathode.

  2. I: hydrogen at the cathode, used as fuel, is correct. III: NaOH near the cathode, used for making soap, is correct.

  3. II is wrong: chlorine is formed at the anode, but margarine is made using hydrogen, not chlorine. IV is wrong: NaOH forms near the cathode, not the anode, and bleaching powder is made from chlorine. So only I and III are correct, option (B).

    1 mark

Answer: Option (B): I and III

Where the marks are

  • Identifies I and III as correct and rejects II and IV, option (B) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Acids, Bases and Salts, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.