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Q 2611523429.     (a) Which metal in the first transition series (3d series) exhibits `+1` oxidation state most frequently and why?
(b) Which of the following cations are coloured in aqueous solutions and why?
`Sc^(3+) , V^(3+) , Ti^(4+) ,Mn^(2+)`
(At. Nos. `Sc = 21, V = 23, Ti = 22, Mn =25` )
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)