Which one of the following sets correctly represents the increase in the paramagnetic property of the ions? (A) Ti³+ < Fe²+ < Cr³+ < Mn²+ (B) Ti³+ < Mn²+ < Fe²+ < Cr³+ (C) Mn²+ < Fe²+ < Cr³+ < Ti³+ (D) Ti³+ < Cr³+ < Fe²+ < Mn²+

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

CBSE Class 12 Chemistry sample paper 2024-25: question 9

From the official CBSE sample question paper for 2024-25, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · MCQThe d- and f-Block Elements

Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?

(A) $T i^{3 +} < F e^{2 +} < C r^{3 +} < M n^{2 +}$
(B) $T i^{3 +} < M n^{2 +} < F e^{2 +} < C r^{3 +}$
(C) $M n^{2 +} < F e^{2 +} < C r^{3 +} < T i^{3 +}$
(D) $T i^{3 +} < C r^{3 +} < F e^{2 +} < M n^{2 +}$

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

Write the 3d configuration of each ion.

Hint 2

More unpaired electrons means stronger paramagnetism.

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.

Unpaired electrons: Ti $^{3 +}$ ( $3 d^{1}$ ) = 1, Cr $^{3 +}$ ( $3 d^{3}$ ) = 3, Fe $^{2 +}$ ( $3 d^{6}$ ) = 4, Mn $^{2 +}$ ( $3 d^{5}$ ) = 5.
Paramagnetism increases with the number of unpaired electrons. Option (D).
1 mark

Answer: Option (D)

Where the marks are

Counts the unpaired electrons and orders the ions (1 mark)

Revise the chapter

Chapter: The d- and f-Block Elements (notes, formulas, where marks are lost and every past question)

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CBSE Class 12 Chemistry sample paper 2024-25: question 9

Hints

Step-by-step solution

Revise the chapter

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