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Which of the following is a… (Class 10 Science 2024, Q2)

questionbuddy.in/q/cbse-10-science-2024-31-5-1-q2-redox-reaction-but-not-combination

ScienceCBSE Class 10 · Board exam 2024, set 31/5/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 2

Set in the CBSE Class 10 board exam of 2024, paper 31/5/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQChemical Reactions and Equations

Which of the following is a redox reaction, but not a combination reaction?

  1. (A)
  2. (B)
  3. (C)
  4. (D)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/5/1.

Hints

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

Hint 1

A combination reaction gives a single product.

Hint 2

Look for the reaction that has two products and still involves oxygen transfer.

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), (B) and (C) each form a single product from two reactants, so they are combination reactions.

  2. In (D), Fe₂O₃ is reduced to Fe and CO is oxidised to CO₂. It gives two products, so it is redox but not combination. Option (D).

    1 mark

Answer: Option (D)

Where the marks are

  • Chooses (D) (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 paper2024 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.