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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
Colour in transition metal compounds is attributed to:
  • A
    Small size of metal ions.
  • B
    Absorption of light in $UV$ region.
  • C
    Complete $(ns)$ subshell.
  • ✓
    Incomplete $(n−1)d$ subshell.
✓

Answer

Correct option: D.
Incomplete $(n−1)d$ subshell.
Any compound or ion showing colour is due to presence of unpaired electron. Transition metal compounds have incomplete $(n-1)d$ sub shell and because of that they have unpaired electron and thus they show colour.

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