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Which one of the following… (Class 10 Science 2024, Q7)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 7

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQChemical Reactions and Equations

Which one of the following reactions is different from the remaining three ?

  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 31/3/1.

Hints

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

Hint 1

Count the number of products in each reaction.

Hint 2

Which reaction has two reactants forming only one product?

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. In (A), (C) and (D), two compounds exchange ions to form two new compounds. These are double displacement reactions.

  2. In (B), , two substances form a single product. This is a combination reaction, so (B) is different.

    1 mark

Answer: , option (B)

Where the marks are

  • Recognises (B) as a combination reaction and the others as double displacement (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 31/3/1: 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.