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

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2024: question 17

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, 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) : Different metals have different reactivities with water and dilute acids.
Reason (R) : Extraction of a metal from its ore depends on its position in the reactivity series.

  1. (A)Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. (B)Both (A) and (R) are true, but (R) is not the 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 31/2/1.

Hints

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

Hint 1

Check each statement on its own first.

Hint 2

Does the method of extraction explain differences in reactivity?

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) is true: for example, Na reacts violently with cold water while Cu does not react with water or dilute acids.

    ½ mark

  2. (R) is true: metals at the top, middle and bottom of the reactivity series are extracted by different methods. But (R) is about extraction and does not explain why reactivities differ. Option (B) is correct.

    ½ mark

Answer: Option (B)

Where the marks are

  • Both statements true, R not the explanation: option (B) (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 31/2/1: 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.