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Some metals react with acids… (Class 10 Science 2024, Q21b)

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ScienceCBSE Class 10 · Board exam 2024, set 31/4/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 21(b)

Set in the CBSE Class 10 board exam of 2024, paper 31/4/1, section B, question 21(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q21(b) · 2 marks · Very short answerMetals and Non-metals

Some metals react with acids to produce salt and hydrogen gas. Illustrate it with an example. How will you test the presence of this gas ?

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/4/1.

Hints

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

Hint 1

Recall the activity in which zinc granules are added to dilute sulphuric acid.

Hint 2

Hydrogen is a combustible gas. What happens when a flame is brought near it?

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. Example: zinc granules react with dilute sulphuric acid to form the salt zinc sulphate and hydrogen gas:

    1 mark

  2. Test: bring a burning matchstick or candle near the mouth of the tube. The gas burns with a pop sound, which confirms that it is hydrogen.

    1 mark

Answer: ; hydrogen burns with a pop sound when a burning matchstick is brought near it.

Where the marks are

  • Correct balanced equation of a metal with an acid giving a salt and H₂ (1 mark)
  • Pop-sound test with a burning matchstick (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 paper2024 board paper, set 31/4/1: 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.