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Question

Which of the following is/are correct representation of the property stated against it?

A
V2+<Ti2+<Mn2+<Fe2+:Magnetic moment
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B
Ni2+<Co2+<Fe2+<Mn2+:Ionic size
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C
Co3+<Fe3+<Cr3+<Sc3+:Stability in aqueous solution
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D
VO+2<Cr2O27<MnO4:Increasing oxidising power
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Solution

The correct options are
B Ni2+<Co2+<Fe2+<Mn2+:Ionic size
D VO+2<Cr2O27<MnO4:Increasing oxidising power
(a) Magnetic momentn
Since, magnetic moment =n(n+2), where n is number of unpaired electron.
n for V2+,Ti2+,Mn2+ and Fe2+ is 3, 2, 5 and 4.
So the correct order be: Ti2+<V2+<Fe2+<Mn2+:Magnetic moment

(b) For transition metals, the radii of the cation having same charge decreases from left to right in the same period.

(c) Stability of the transition metal in aqueous solution is directly proportional to the number of unpaired electrons. The half filled and completley filled d-orbitals are extra stable.
[Co]3+=3d61 unpaired electron
[Cr]3+=3d33 unpaired electron
[Fe]3+=3d55 unpaired electron
[Sc]3+=[Ar] inert gas configuration
So the order becomes:
Co3+<Cr3+<Fe3+<Sc3+:Stability in aqueous solution

(d) Oxidising power is the tendency to accept an electron. V+5, Cr+6 and Mn+7 has the same electronic configuration. As the effective nuclear charge increases, oxidising power also increases.

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