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The solution in the… (Class 10 Science SQP 2024-25, Q3)

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

CBSE Class 10 Science sample paper 2024-25: question 3

From the official CBSE sample question paper for 2024-25, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQAcids, Bases and Salts

The solution in the given figure is likely to be

(For Visual Impaired Students: Which among the following is considered as the strongest electrolyte? A. Dilute acid B. Dilute sugar solution C. Glucose solution D. Ethanol in water)

  1. (A)HNO3
  2. (B)C2H5OH
  3. (C)H2SO4
  4. (D)CO2 in water

Figure in the paper: A beaker containing a solution with two electrodes connected to a battery and a bulb; the bulb does not glow. The solution is labelled '?'. See it in the official paper.

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

What does a bulb that does not glow tell you about ions in the solution?

Hint 2

Which of these substances does not release H⁺ ions in water?

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 bulb does not glow, so the solution does not conduct electricity. It therefore contains no free ions, which means it is a non-electrolyte.

    ½ mark

  2. , and in water (carbonic acid) all produce ions. Ethanol, , does not ionise in water. The answer is , option (B). (For the VI alternative, the strongest electrolyte is dilute acid, option A.)

    ½ mark

Answer: C₂H₅OH, option (B) (VI alternative: dilute acid, option A)

Where the marks are

  • Recognises that the non-glowing bulb means a non-conducting solution and chooses C₂H₅OH (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.