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Define a precipitation… (Class 10 Science 2025, Q27B)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 27(B)

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section C, question 27(B), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q27(B) · 3 marks · Short answerChemical Reactions and Equations

Define a precipitation reaction. Give its example and also express the reaction that occurs in the form of a balanced chemical equation.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

Think of an NCERT reaction where a white insoluble solid appears on mixing two solutions.

Hint 2

Barium ions and sulphate ions form an insoluble salt.

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 precipitation reaction is a reaction in which an insoluble substance (precipitate) is formed when solutions of two compounds are mixed.

    1 mark

  2. Example: When sodium sulphate solution is added to barium chloride solution, a white precipitate of barium sulphate is formed.

    1 mark

  3. 1 mark

Answer: A reaction that forms an insoluble precipitate; e.g. (white ppt).

Where the marks are

  • Correct definition of a precipitation reaction (1 mark)
  • Suitable example (1 mark)
  • Correct balanced equation (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 paper2025 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.