BITSAT2017ChemistryCoordination CompoundsActual
Which of the following is a diamagnetic complex
Options
- ACo NH 3 6 3 +
- BNiCl 4 2 -
- CCuCl 4 2 -
- DFe H 2 O 6 3 +
Correct answer
A. Co NH 3 6 3 +
Step-by-step solution
Among the given option (a) is a diamagnetic complex. (a) Co NH 3 6 3 + ⇒ Co 27 ⇒ Co 3 + = 3 d 6 4 s 0 . Thus, has no unpaired electrons and is a diamagnetic complex. (b) NiCl 4 2 - ⇒ Ni 28 ⇒ Ni 2 + = 3 d 8 4 s 0 Thus, has two unpaired electrons is paramagnetic. (c) CuCl 4 2 - ⇒ Cu 29 ⇒ Cu 2 + = 3 d 9 4 s 0 Thus, has one unpaired electrons and is paramagnetic. (d) Fe H 2 O 6 3 + ⇒ Fe 26 ⇒ Fe 3 + = 3 d 5 4 s 0 Thus, has five unpaired electrons and is paramagnetic.