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State whether the given… (Class 10 Science 2023, Q21)

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ScienceCBSE Class 10 · Board exam 2023, set 31/6/1 · 2 marks · Very short answer

CBSE Class 10 Science 2023: question 21

Set in the CBSE Class 10 board exam of 2023, paper 31/6/1, section B, question 21, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q21 · 2 marks · Very short answerChemical Reactions and Equations

State whether the given chemical reaction is a redox reaction or not. Justify your answer.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/6/1.

Hints

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

Hint 1

Recall that oxidation is gain of oxygen or loss of hydrogen, and reduction is the opposite.

Hint 2

Follow what happens to MnO₂ (look at its oxygen) and to HCl (look at its hydrogen).

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. Yes, it is a redox reaction, because oxidation and reduction take place together in it.

    1 mark

  2. loses hydrogen and forms , so HCl is oxidised to .

    ½ mark

  3. loses oxygen and forms , so MnO₂ is reduced to .

    ½ mark

Answer: Yes, it is a redox reaction: HCl is oxidised to Cl₂ and MnO₂ is reduced to MnCl₂.

Where the marks are

  • States that it is a redox reaction (1 mark)
  • HCl oxidised to Cl₂ (loss of hydrogen) (½ mark)
  • MnO₂ reduced to MnCl₂ (loss of oxygen) (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Chemical Reactions and Equations, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 31/6/1: 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.