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Copper powder is taken in a… (Class 10 Science 2024, Q21a)

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ScienceCBSE Class 10 · Board exam 2024, set 31/5/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 21(a)

Set in the CBSE Class 10 board exam of 2024, paper 31/5/1, section B, question 21(a), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q21(a) · 2 marks · Very short answerChemical Reactions and Equations

Copper powder is taken in a china dish and heated over a burner. Name the product formed and state its colour. Write the chemical equation for the reaction involved.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/5/1.

Hints

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

Hint 1

Heating in an open china dish lets air reach the copper. Which gas in air will react with it?

Hint 2

Copper combines with oxygen. Think about the colour of the coating that forms on the brown powder.

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. On heating, the surface of the copper powder combines with oxygen of the air. The product formed is copper(II) oxide (CuO).

    ½ mark

  2. The brown copper powder becomes coated with a black substance; copper oxide is black.

    ½ mark

  3. Balanced equation: (black)

    1 mark

Answer: Copper(II) oxide, black in colour;

Where the marks are

  • Names the product as copper oxide (½ mark)
  • States its colour as black (½ mark)
  • Writes the 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 paper2024 board paper, set 31/5/1: 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.