MCQ
Which of the following compound is coloured ?
- A$TiCl_3$
- B$FeCl_3$
- C$CoCl_2$
- ✓All of these
✓
Answer
Correct option: D.
All of these
d
The colour is due to presence of unpaired $d-$ electrons.
The colour is due to presence of unpaired $d-$ electrons.
$Ti^{3+} = [Ar]\, 3d^1$ (one unpaired electron)
$Fe^{3+} = [Ar] \,3d^5$ (five unpaired electrons)
$Co^{2+} = [Ar]\, 3d^7$ (three unpaired electrons)
So all of them are coloured.
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