Skip to content

The warning sign shown in the… (Class 10 Science 2025, Q2)

questionbuddy.in/q/cbse-10-science-2025-31-2-1-q2-warning-sign-must-invariably-displayed

ScienceCBSE Class 10 · Board exam 2025, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 2

Set in the CBSE Class 10 board exam of 2025, paper 31/2/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQAcids, Bases and Salts

The warning sign shown in the given figure must invariably be displayed/pasted on the containers which contain hydroxide of :

  1. (A)Aluminium
  2. (B)Calcium
  3. (C)Sodium
  4. (D)Magnesium

Figure in the paper: A red-bordered triangular warning sign with a yellow centre showing a hand with drops falling on it and test tubes/containers, indicating a corrosive substance. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/2/1.

Hints

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

Hint 1

What hazard does a hand being damaged by dripping liquid stand for?

Hint 2

Which of these hydroxides is a strong, highly soluble alkali (caustic soda)?

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 sign shows liquid dropping onto a hand and eating into it. This is the corrosive hazard symbol.

  2. Of the hydroxides listed, sodium hydroxide (NaOH, caustic soda) is a strong alkali that is highly soluble. It is strongly corrosive and burns the skin.

  3. The hydroxides of aluminium and magnesium are weak bases that dissolve only slightly, and calcium hydroxide is much milder. So the container must hold sodium hydroxide: (C).

    1 mark

Answer: (C) Sodium

Where the marks are

  • Identifies sodium hydroxide as the corrosive substance, option (C) (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 31/2/1: 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.