Which of the following arrangements does not represent the …

Chemistry D and F - Block Elements General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

Which of the following arrangements does not represent the correct order of the property stated against it?

V2+< Cr2+<Mn2+< Fe2+ : paramagnetic behaviour

Ni2+< Co2+< Fe2+<Mn2+ : ionic size

Co3+< Fe3+< Cr3+<Sc3+ : stability in aqueous solution

Sc< Ti < Cr <Mn : number of oxidation states

Text Solution

Verified by Experts

The correct answer is:

(1) V2+ = 3 unpaired electrons

Cr2+ = 4 unpaired electrons

Mn2+ = 5 unpaired electrons

Fe2+ = 4 unpaired electrons

Hence the order of paramagnetic behaviour should be

V2+ < Cr2+ = Fe2+ < Mn2+

(2) ionic size decrease from left to right in same period.

(3) As per data from NCERT.

Co3+ /Co2+= 1.97 ; Fe3+/Fe2+ =0.77 ; Cr3+ /Cr2+= - 0.41

Sc3+ is highly stable (It does not show +2)

(4) The oxidation states increases as we go from group 3 to group 7 in same period.

Previous Question Next Question

Get practice questions, solutions, and test series in one place.

Share your experience with this question and solution.

Send your comment, doubt, correction, or feedback to admin.

What students say about this solution

No reviews yet. Be the first to write a review.