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Consider the following cases… (Class 10 Science 2024, Q5)

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 5

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

Q5 · 1 mark · MCQMetals and Non-metals

Consider the following cases :
(a)
(b)
(c)
(d)

The cases in which new products will form are –

  1. (A)(a) and (b)
  2. (B)(b) and (c)
  3. (C)(c) and (d)
  4. (D)(b) and (d)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

Compare each free metal with the metal in the salt using the reactivity series.

Hint 2

A displacement happens only when the free metal is above the metal in the salt.

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. A metal displaces another metal from its salt solution only if it is more reactive. Use the reactivity series: K > Ca > Na > Mg > Al > Zn > Fe > Pb > H > Cu.

  2. (a) Al is less reactive than Ca, so there is no reaction. (b) Ca is more reactive than Cu, so a reaction occurs. (c) Cu is less reactive than Fe, so there is no reaction. (d) Mg is more reactive than Zn, so a reaction occurs.

    ½ mark

  3. New products form in (b) and (d). Option (D) is correct.

    ½ mark

Answer: (b) and (d): option (D)

Where the marks are

  • Chooses option (D), cases (b) and (d) (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 paper2024 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.