NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice
Which of the following compounds is expected to be coloured?
Options
- AC u F 2
- BC u C l
- CA g 2 S O 4
- DM g F 2
Correct answer
A. C u F 2
Step-by-step solution
The electronic configurations of cations in the given salts are as follows C u + ( 3 d 10 ) , C u 2 + ( 3 d 9 ) , A g + ( 4 d 10 ) , M g 2 + ( 2 s 2 2 p 6 ) Hence only C u 2 + ion has one unpaired electron in 3d orbital it means d-d electronic transition is possible, so its salt is coloured.