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How is zinc extracted from… (Class 10 Science 2025, Q22B)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 22(B)

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section B, question 22(B), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q22(B) · 2 marks · Very short answerMetals and Non-metals

How is zinc extracted from its ore? Name the processes involved in the extraction and write chemical equations for the reactions that occur during these processes.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

Metals of medium reactivity are easier to obtain from their oxides.

Hint 2

Think about how a sulphide or carbonate ore can be converted into an oxide, and which cheap reducing agent is then used.

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. Zinc is in the middle of the activity series. Its sulphide or carbonate ore is first changed into the oxide, and the oxide is then reduced with carbon.

  2. Roasting (for the sulphide ore, zinc blende): the ore is heated strongly in excess air.

    1 mark

  3. Reduction: the zinc oxide is heated with carbon (coke).

    1 mark

  4. Alternatively, for the carbonate ore the first step is calcination (strong heating in limited air): . This is followed by the same reduction with carbon.

Answer: Roasting: (or calcination: ), then reduction: .

Where the marks are

  • Names roasting or calcination (½ mark)
  • Writes the correct equation for roasting or calcination (½ mark)
  • Names reduction with carbon (½ mark)
  • Writes the correct equation (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Metals and Non-metals, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/4/1: 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.