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Distinguish between a… (Class 10 Science 2024, Q22)

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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 22

Set in the CBSE Class 10 board exam of 2024, paper 31/4/1, section B, question 22, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q22 · 2 marks · Very short answerCarbon and its Compounds

Distinguish between a saturated and an unsaturated hydrocarbon by flame test. List the products of combustion reaction of a saturated hydrocarbon.

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

Compare complete and incomplete combustion.

Hint 2

Write the equation for burning methane in oxygen.

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. A saturated hydrocarbon burns with a clean blue flame, because combustion is complete.

    ½ mark

  2. An unsaturated hydrocarbon burns with a yellow, sooty flame that gives a lot of black smoke, because combustion is incomplete.

    ½ mark

  3. Products of combustion of a saturated hydrocarbon: carbon dioxide and water, along with heat and light. For example, + heat + light.

    1 mark

Answer: Saturated: clean blue flame; unsaturated: yellow sooty flame. Products: CO₂ and H₂O (with heat and light).

Where the marks are

  • Saturated hydrocarbon gives a blue/clean flame (½ mark)
  • Unsaturated hydrocarbon gives a yellow sooty flame (½ mark)
  • Names carbon dioxide (½ mark)
  • Names water (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Carbon and its Compounds, 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.