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Which one of the following… (Class 12 Chemistry 2024, Q1)

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ChemistryCBSE Class 12 · Board exam 2024, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2024: question 1

Set in the CBSE Class 12 board exam of 2024, paper 56/1/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQThe d- and f-Block Elements

Which one of the following first row transition elements is expected to have the highest third ionization enthalpy ?

  1. (A)Iron (Z = 26)
  2. (B)Manganese (Z = 25)
  3. (C)Chromium (Z = 24)
  4. (D)Vanadium (Z = 23)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 56/1/1.

Hints

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

Hint 1

Write the configuration of each M ion.

Hint 2

Which M ion has a half-filled d subshell?

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. Third ionisation removes an electron from the M ion. Mn is , a stable half-filled configuration.

  2. Removing an electron from this stable arrangement needs the most energy, so Mn has the highest third ionisation enthalpy.

    1 mark

Answer: Manganese, option (B)

Where the marks are

  • Identifies Mn ( in Mn) as having the highest third ionisation enthalpy (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 paper2024 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.