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Assertion (A) : A piece of… (Class 10 Science 2024, Q17)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2024: question 17

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, section A, question 17, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q17 · 1 mark · Assertion-reasonCompetency-basedMetals and Non-metals

Assertion (A) : A piece of Zinc metal gets reddish brown coating when kept in copper sulphate solution for some time.
Reason (R) : Copper is more reactive metal than Zinc.
Q. Nos. 17 to 20 consist of two statements – Assertion (A) and Reason (R), answer these questions selecting the appropriate option given below.

  1. (A)Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. (B)Both (A) and (R) are true and (R) is not correct explanation of (A).
  3. (C)(A) is true, but (R) is false.
  4. (D)(A) is false, but (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

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

Hint 1

Which metal is higher in the reactivity series?

Hint 2

A more reactive metal displaces a less reactive one from its salt solution.

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. Assertion is true. Zinc displaces copper: , and the copper deposits as a reddish brown coating.

  2. Reason is false. Zinc is more reactive than copper, which is why it displaces copper. So A is true and R is false, option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • A true, R false because zinc is more reactive than copper (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 paper2024 board paper, set 31/3/1: 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.