JEE Main202122 Jul 2021Morning ShiftChemistryd and f Block ElementsActual
The set having ions which are coloured and paramagnetic both is -
Options
- ACu 2 + ,   Cr 3 + ,   Sc +
- BCu 2 + ,   Zn 2 + ,   Mn 4 +
- CSc 3 + ,   V 5 + ,   Ti 4 +
- DNi 2 + ,   Mn 7 + ,   Hg 2 +
Correct answer
A. Cu 2 + ,   Cr 3 + ,   Sc +
Step-by-step solution
Cu 2 + : [ Ar ] 3   d 9 4   s 0 Cr 3 + : [ Ar ] 3   d 3 4   s 0 Sc + : [ Ar ] 3   d 1 4   s 1 All are coloured and paramagnetic due to presence of unpaired electrons.