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STD 12 - 4. d and f- block elements — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 4. d and f- block elements4 Marks
MCQ
Cuprous ion is colourless while cupric ion is coloured because
  • A
    Both have half filled $p-$ and $d-$ orbitals
  • B
    Cuprous ion has incomplete $d-$ orbitaland cupric ion has a complete $d-$ orbital
  • C
    Both have unpaired electrons in the $d-$ orbitals
  • ✓
    Cuprous ion has complete $d-$ orbital and cupric ion has an incomplete $d-$ orbital.
✓

Answer

Correct option: D.
Cuprous ion has complete $d-$ orbital and cupric ion has an incomplete $d-$ orbital.
d
In $Cu^+\,[Ar]\,3d^{10}$ there is no unpaired electron, $Cu^{2+}\,[Ar]\,3d^9$ contains one unpaired electron hence coloured.

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