MCQ
The aqueous solution containing which one of the following ions will be colourless
- ✓$S{c^{3 + }}$
- B$F{e^{2 + }}$
- C$T{i^{3 + }}$
- D$M{n^{2 + }}$ (Atomic number $Sc = 21,\, Fe = 26, \,Ti = 22, \,Mn = 25)$
✓
Answer
Correct option: A.
$S{c^{3 + }}$
a
(a)$_{21}Sc \to 1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^2}3{d^1}$
(a)$_{21}Sc \to 1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^2}3{d^1}$
$S{c^{ + 3}} \to 1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}$
Due to presence of paired electron it will be colourless.
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