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Identify the product 'X'… (Class 10 Science 2024, Q1)

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

CBSE Class 10 Science 2024: question 1

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, 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

Identify the product 'X' obtained in the following chemical reaction :

  1. (A)Quick lime
  2. (B)Gypsum
  3. (C)Lime Stone
  4. (D)Plaster of Paris

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

This is a thermal decomposition reaction.

Hint 2

Remove from . What compound is left, and what is its common name?

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. When calcium carbonate (limestone) is heated strongly, it breaks down into calcium oxide and carbon dioxide: . This is thermal decomposition.

  2. So 'X' is calcium oxide, , whose common name is quick lime. Option (A).

    1 mark

Answer: Quick lime (CaO), option (A)

Where the marks are

  • Identifies X as quick lime, CaO (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.