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Answer the following. (Class 10 Science 2025, Q21)

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ScienceCBSE Class 10 · Board exam 2025, set 31/2/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 21

Set in the CBSE Class 10 board exam of 2025, paper 31/2/1, 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 answerMetals and Non-metals

Answer the following.

  1. (a)

    In common practice silver is recovered from silver nitrate solution by the use of copper metal. Name the type of reaction that takes place in this process and give the chemical equation of the reaction involved.

    0 marks
  2. (b)

    Name the method used for refining silver.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/2/1.

Hints

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

Hint 1

Compare where Cu and Ag stand in the reactivity series.

Hint 2

Refining of metals like Cu and Ag uses electricity.

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. (a) Copper is more reactive than silver, so it pushes silver out of silver nitrate solution. This is a displacement reaction.

    ½ mark

  2. (a) Equation:

    ½ mark

  3. (b) Silver is refined by electrolytic refining. The impure silver is made the anode and a thin strip of pure silver is the cathode, with a silver salt solution as the electrolyte. Pure silver deposits on the cathode.

    1 mark

Answer: (a) Displacement reaction: ; (b) Electrolytic refining

Where the marks are

  • Names the reaction as displacement (½ mark)
  • Writes the balanced equation for Cu with (½ mark)
  • States electrolytic refining (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Metals and Non-metals, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/2/1: 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.