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Comment on the… (Class 10 Science SQP 2024-25, Q28B)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 3 marks · Short answer

CBSE Class 10 Science sample paper 2024-25: question 28(B)

From the official CBSE sample question paper for 2024-25, section C, question 28(B), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q28(B) · 3 marks · Short answerCompetency-basedAcids, Bases and Salts

Comment on the following statements:
(i) Bee sting is treated with baking soda paste whereas wasp sting is treated with dilute vinegar.
(ii) Farmers treat soil with quicklime when tilling.
(iii) Ancient sculptures and marble structures are conserved by treating them with certain chemicals.

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

All three statements involve the reaction between an acid and a base.

Hint 2

Is baking soda acidic or basic? Is vinegar acidic or basic?

Hint 3

What does acid rain do to calcium carbonate?

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. (i) A bee sting injects an acid (methanoic acid), which the mild base baking soda () neutralises. A wasp sting is basic, so a mild acid such as vinegar (ethanoic acid) neutralises it. In both cases neutralisation relieves the pain.

    1 mark

  2. (ii) Soil can become too acidic, which harms crop growth. Quicklime (CaO) is basic and neutralises the excess acid, bringing the soil to a neutral or slightly basic pH suitable for plants.

    1 mark

  3. (iii) Marble () reacts with acid rain and acidic gases (, ) in the air and corrodes: . Coating sculptures with protective chemicals stops this contact and conserves them.

    1 mark

Answer: (i) Neutralisation: bee sting acidic (base used), wasp sting basic (acid used); (ii) quicklime neutralises acidic soil; (iii) chemicals protect marble from acid rain/acidic gases.

Where the marks are

  • Bee sting acidic, wasp sting basic, so opposite substance neutralises (1 mark)
  • Quicklime neutralises soil acidity (1 mark)
  • Protects marble from acid rain and acidic gases (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Acids, Bases and Salts, 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.