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 13, 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.

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