d and f-Block ElementsHard
Question
Which of the following ions will exhibit colour in aqueous solutions ?
Options
A.La3+ (Z = 57)
B.Ti3+ (Z = 22)
C.Lu3+ (Z = 71)
D.Sc3+ (Z = 21)
Solution
Colour is obtained as a consequence of d-d (or f-f ) transition, and for d-d (or f-f ) transition, presence of unpaired electrons is the necessary condition.
La3+ (Z = 57) = [Xe] 4f0 5d0 6s0 (no unpaired electron)
Ti3+ (Z = 22) = [Ar] 3d1 6s0 (ono unpaired electron)
Lu3+ (Z = 71) = [Xe] 4f14 5d0 6s0 (no unpaired electron)
Sc3+ (Z = 21) = [Ar] 3d0 6s0 (no unpaired electron)
La3+ (Z = 57) = [Xe] 4f0 5d0 6s0 (no unpaired electron)
Ti3+ (Z = 22) = [Ar] 3d1 6s0 (ono unpaired electron)
Lu3+ (Z = 71) = [Xe] 4f14 5d0 6s0 (no unpaired electron)
Sc3+ (Z = 21) = [Ar] 3d0 6s0 (no unpaired electron)
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