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

Bihar 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.
  • D
    Incomplete (n−1)d subshell.
✓

Answer

  1. Incomplete (n−1)d subshell.

Explanation:

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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