MCQ
Which of the following compound is coloured ?
- A$TiCl_3$
- B$FeCl_3$
- C$CoCl_2$
- ✓All of these
$Ti^{3+} = [Ar]\, 3d^1$ (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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| List $I$ (Spectral Series for Hyddrogen) | List $II$ (Spectral Region/Higher Energy State) |
| $A$. Lyman | $I$. Infrared region |
| $B$. Balmer | $II$. $UV$ region |
| $C$. Paschen | $III$. Infrared region |
| $D$. Pfund | $IV$. Visible region |
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