JEE Main202226 Jul 2022Evening ShiftChemistryCoordination CompoundsActual
The metal complex that is diamagnetic is (Atomic number : Fe , 26 ; Cu , 29 )
Options
- AK 3 Cu CN 4
- BK 2 Cu CN 4
- CK 3 Fe CN 4
- DK 4 FeCl 6
Correct answer
A. K 3 Cu CN 4
Step-by-step solution
K 3 Cu CN 4 : Cu CN 4 - 3 Oxidation number of of copper is Cu + 1 Electronic configuration of Cu + 1 = Ar 3   d 10 4 s 0 Due to the absence of unpaired electrons, their spin only magnetic moment is zero, they are diamagnetic in nature K 2 Cu CN 4 : Cu CN 4 2 - ,   Cu 2 + = Ar 3 d 9 one unpaired electron is present.Hence, paramagnetic in nature. K 4 FeCl 6 : FeCl 6 - 4 , Fe + 2 :   Ar   3 d 6   4 s 0 , one   unpaired   electron .Hence, paramagnetic in nature.