CBSE Class 12 Chemistry 2013 Solved Paper

Question : 15

Total: 30

(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?
Sc3+,V3+,Ti4+,Mn2+
(At. Nos. Sc=21,V=23,Ti=22,Mn=25 )

Solution:

(a) Copper metal shows +1 oxidation state because its electronic configuration is [Ar]3d104s1.
It can easily donate one electron from 4s1 and exhibit +1 oxidation state.
(b) V3+ and Mn2+ are coloured transition metal because of presence of unpaired electron and shows d−d transition. While Sc3+ and mathrm‌Ti4+ are colourless because here d-orbitals are empty and there is no d−d transition take place.

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