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The following table shows the… (Class 10 Science 2025, Q3)

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ScienceCBSE Class 10 · Board exam 2025, set 31/1/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 3

Set in the CBSE Class 10 board exam of 2025, paper 31/1/1, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQCompetency-basedAcids, Bases and Salts

The following table shows the pH values of four solutions A, B, C and D on a pH scale: a scale numbered 1 to 14. B is marked with an arrow pointing up at 7; C is marked with an arrow pointing down at 13; D is marked with an arrow pointing down at 3; A is marked with an arrow pointing down at 5. The solutions A, B, C and D respectively are of a

  1. (A)Strong acid, weak acid, neutral, strong base
  2. (B)Weak acid, neutral, weak base, strong base
  3. (C)Weak acid, neutral, strong base, weak base
  4. (D)Weak acid, neutral, strong base, strong acid

Figure in the paper: A pH scale drawn as a row of boxes numbered 1 to 14. Circled B has an arrow pointing up to the box numbered 7. Circled C has an arrow pointing down to the box numbered 13. Circled D has an arrow pointing down to the box numbered 3. Circled A has an arrow pointing down to the box numbered 5. See it in the official paper.

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

Hints

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

Hint 1

pH 7 is neutral, below 7 is acidic and above 7 is basic.

Hint 2

The further the pH is from 7, the stronger the acid or base.

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 has pH 5. This is slightly below 7, so A is a weak acid. B has pH 7, so B is neutral.

  2. C has pH 13, which is far above 7, so C is a strong base. D has pH 3, which is far below 7, so D is a strong acid.

  3. The order is weak acid, neutral, strong base, strong acid, which is option (D).

    1 mark

Answer: Option (D)

Where the marks are

  • Chooses option (D) (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 paper2025 board paper, set 31/1/1: 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.