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Which of the following is… (Class 12 Chemistry 2026, Q3)

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ChemistryCBSE Class 12 · Board exam 2026, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2026: question 3

Set in the CBSE Class 12 board exam of 2026, paper 56/1/1, 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

Which of the following is not a transition metal ?

  1. (A)Sc
  2. (B)Ag
  3. (C)Hg
  4. (D)Cu

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 56/1/1.

Hints

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

Hint 1

Recall the definition of a transition element.

Hint 2

Write the configuration of Hg and of .

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 transition metal has an incompletely filled d subshell in the atom or in one of its common ions.

  2. Hg is , and is . Its d subshell is always full, so Hg is not a transition metal: option (C).

    1 mark

Answer: Option (C) Hg

Where the marks are

  • Identifies Hg because its d subshell stays full (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 paper2026 board paper, set 56/1/1: 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.