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The gases evolved on heating… (Class 10 Science 2026, Q19)

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

CBSE Class 10 Science 2026: question 19

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section B, question 19, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q19 · 1 mark · MCQChemical Reactions and Equations

The gases evolved on heating lead (II) nitrate crystals are:

  1. (A)NO and O2
  2. (B)N2 and NO2
  3. (C)NO2 and H2
  4. (D)NO2 and O2

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

Hints

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

Hint 1

Write the decomposition equation for lead nitrate.

Hint 2

Brown fumes are seen and a gas that supports burning is also 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. On heating, lead(II) nitrate undergoes thermal decomposition:

  2. The gases given off are brown nitrogen dioxide () and oxygen (). Correct option: (D).

    1 mark

Answer: NO₂ and O₂, option (D)

Where the marks are

  • Identifies NO₂ and O₂ as the gases evolved (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Chemical Reactions and Equations, one at a time, marked against the answer key and marking points.Back to the full paper2026 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.