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Assertion (A): On… (Class 10 Science SQP 2024-25, Q17)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 1 mark · Assertion-reason

CBSE Class 10 Science sample paper 2024-25: question 17

From the official CBSE sample question paper for 2024-25, 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): On adding dil. HCl to a test tube containing a substance 'X', a colourless gas is produced which gives a pop sound when a burning match stick is brought near it.
Reason (R): In this reaction metal 'X' is displaced by Hydrogen.

  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 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 sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

Which gas burns with a pop sound?

Hint 2

In metal + acid reactions, which element replaces which?

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 reactive metal X reacts with dilute HCl and releases hydrogen gas, which burns with a pop sound. So A is true.

    ½ mark

  2. In this reaction the metal displaces hydrogen from the acid (). Hydrogen does not displace the metal, so R is false. The answer is option (C).

    ½ mark

Answer: A is true but R is false; option (C)

Where the marks are

  • States that A is true and R is false because the metal displaces hydrogen (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 paperSample paper 2024-25: 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.