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Which gas is evolved when… (Class 10 Science 2026, Q23)

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ScienceCBSE Class 10 · Board exam 2026, set 31/5/1 · 1 mark · MCQ

CBSE Class 10 Science 2026: question 23

Set in the CBSE Class 10 board exam of 2026, paper 31/5/1, section B, question 23, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q23 · 1 mark · MCQMetals and Non-metals

Which gas is evolved when magnesium metal reacts with very dilute ?

  1. (A)Oxygen
  2. (B)Nitrogen
  3. (C)Hydrogen
  4. (D)Nitrogen Dioxide

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/5/1.

Hints

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

Hint 1

Mg and Mn are the special case with nitric acid.

Hint 2

When a metal reacts with an acid, which gas is normally released?

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. HNO₃ is a strong oxidising agent, so it usually oxidises any H₂ formed to water. Very dilute HNO₃ is an exception for Mg and Mn.

  2. With very dilute HNO₃, Mg releases hydrogen gas: . Answer: (C).

    1 mark

Answer: (C) Hydrogen

Where the marks are

  • Hydrogen gas (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 paper2026 board paper, set 31/5/1: 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.