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Match the properties… (Class 12 Chemistry SQP 2024-25, Q3)

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ChemistryCBSE Class 12 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2024-25: question 3

From the official CBSE sample question paper for 2024-25, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQThe d- and f-Block Elements

Match the properties given in column I with the metals in column II

Column IColumn II
(i) Actinoid having configuration [Rn] (A) Ce
(ii) Lanthanoid which has electronic configuration in +3 oxidation state.(B) Lu
(iii) Lanthanoid which show +4 Oxidation state(C) Cm
  1. (A)(i)-(C), (ii)-(B), (iii)-(A)
  2. (B)(i)-(C), (ii)-(A), (iii)-(B)
  3. (C)(i)-(A), (ii)-(B), (iii)-(C)
  4. (D)(i)-(B), (ii)-(A), (iii)-(C)

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

Count the electrons beyond [Rn] to find the actinoid.

Hint 2

Ask which lanthanoid reaches in +4 and which has a full in +3.

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. [Rn] is Cm (Z = 96). Lu is [Xe]. Ce shows +4 because it attains the stable configuration.

    1 mark

  2. So (i)-(C), (ii)-(B), (iii)-(A). Option (A).

Answer: Option (A)

Where the marks are

  • Correct matching Cm, Lu, Ce (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from The d- and f-Block Elements, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2024-25: 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.