Skip to content

Giving one example of each… (Class 10 Science 2024, Q21b)

questionbuddy.in/q/cbse-10-science-2024-31-2-1-q21b-giving-example-differentiate-between-displacement

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

CBSE Class 10 Science 2024: question 21(b)

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, 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 answerChemical Reactions and Equations

Giving one example of each, differentiate between a displacement reaction and a double displacement reaction.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

In one type a single element takes another's place; in the other, two compounds swap partners.

Hint 2

Recall the iron nail kept in copper sulphate solution.

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. Displacement reaction: a more reactive metal displaces a less reactive metal from its salt solution. Example:

    1 mark

  2. Double displacement reaction: two compounds exchange their ions. Example:

    1 mark

Answer: Displacement: a more reactive element replaces a less reactive one (Fe + CuSO₄). Double displacement: two compounds exchange ions (Na₂SO₄ + BaCl₂).

Where the marks are

  • Defines displacement reaction with a correct example (1 mark)
  • Defines double displacement reaction with a correct example (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 31/2/1: 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.