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For Questions number 17 to 20… (Science 2025 31/3/1 Q17)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2025: question 17

Set in the CBSE Class 10 board exam of 2025, 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

For Questions number 17 to 20, two statements are given, one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer from the codes (A), (B), (C) and (D) given below: (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.

Assertion (A): Hydrogen gas is not evolved when a metal reacts with nitric acid.

Reason (R): Nitric acid is a strong reducing agent and reduces the hydrogen produced in the reaction to water.

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

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

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

Hint 1

Does converting to involve oxidation or reduction of hydrogen?

Hint 2

A substance that oxidises another substance is called an oxidising agent.

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. The Assertion is true: metals generally do not give with nitric acid.

  2. The Reason is false: is a strong oxidising agent, not a reducing agent. It oxidises the produced to water and is itself reduced to nitrogen oxides. So the answer is option (C).

    1 mark

Answer: (C) A is true, R is false

Where the marks are

  • Recognises that nitric acid is an oxidising agent, so R is false while A is true (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 31/3/1: 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.