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The colour of the… (Class 10 Science SQP 2023-24, Q2)

questionbuddy.in/q/cbse-10-science-2023-24-sqp-q2-colour-solution-observed-after-minutes

ScienceCBSE Class 10 · Sample paper, session 2023-24 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2023-24: question 2

From the official CBSE sample question paper for 2023-24, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQMetals and Non-metals

The colour of the solution observed after 30 minutes of placing zinc metal to copper sulphate solution is

  1. (A)Blue
  2. (B)Colourless
  3. (C)Dirty green
  4. (D)Reddish Brown

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

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

Hint 1

Which metal is more reactive, zinc or copper?

Hint 2

Think about the colour of the zinc salt that forms in the solution.

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 more reactive than copper, so it displaces copper:

  2. The blue is used up and colourless forms. The solution becomes colourless, so the answer is option (B).

    1 mark

Answer: Colourless, option (B)

Where the marks are

  • Recognises that zinc sulphate solution formed is colourless (1 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 paperSample paper 2023-24: 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.