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Select from the following a… (Class 10 Science 2024, Q3)

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 3

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQChemical Reactions and Equations

Select from the following a process in which a combination reaction is involved :

  1. (A)Black and White photography
  2. (B)Burning of coal
  3. (C)Burning of methane
  4. (D)Digestion of food

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

A combination reaction gives a single product.

Hint 2

Write the reaction for burning carbon 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. In a combination reaction, two or more reactants join to form a single product.

  2. When coal burns, . Two reactants give one product, so this is a combination reaction.

    ½ mark

  3. Black and white photography is decomposition of AgBr. Burning methane gives two products, and . Digestion is breakdown of food. So the answer is option (B).

    ½ mark

Answer: Burning of coal: option (B)

Where the marks are

  • Selects burning of coal, option (B) (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.