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Which of the following is an… (Class 10 Science 2023, Q1)

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ScienceCBSE Class 10 · Board exam 2023, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 1

Set in the CBSE Class 10 board exam of 2023, paper 31/2/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQChemical Reactions and Equations

Which of the following is an example of endothermic process ?

  1. (A)Formation of slaked lime
  2. (B)Decomposition of vegetable matter into compost
  3. (C)Dissolution of ammonium chloride in water
  4. (D)Digestion of food in our body

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/2/1.

Hints

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

Hint 1

Endothermic means heat is absorbed.

Hint 2

Which of these makes its container feel cold?

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. An endothermic process absorbs heat. When ammonium chloride dissolves in water, the solution becomes cold because heat is absorbed from the surroundings.

    1 mark

  2. Slaking of lime, composting and digestion all release heat, so they are exothermic.

Answer: (C) Dissolution of ammonium chloride in water

Where the marks are

  • Chooses dissolution of NHCl as the endothermic process (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 paper2023 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.