The magnetic moments of few transition metal ions are given below :
`{:("Metal ion":,Sc^(3+),Cr^(2+),Ni^(2+),Ti^(3+)),("Megnetic moment (BM):",0.00,4.90,2.84,1.73):}`
(at no. Sc=21, Ti =22, Cr=24,Ni =28)
Which of the given metals ions:
(i) has the maximum number of unpaired electrons ?
(ii) forms colourless aqueous solution ?
(iii) exhibits most stable +3 oxidation state ?

Explanation

(i) `Cr^(2+)` ion (`3d^(4)` configuration) has maximum number of unpaired electrons.
(ii) `Sc^(3+)` ion ( Ar-configuration) forms colourless solution.
(iii) `Sc^(3+)` ion (Ar-configuration) exhibits most stable +3 oxidation state. .