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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
Identify the metal that forms colourless compounds.
  • A
    Iron (Z = 26)
  • B
    Chromium (Z = 24)
  • C
    Vanadium (Z = 23)
  • D
    Scandium (Z = 21)
✓

Answer

  1. Scandium (Z = 21)

Explanation:

Scandium(Z = 21) forms colourless compounds.

Scandium(Z = 21)  has valence shell electron configuration of 3d14s2

In its +3 oxidation state, it looses 3 electrons and has valence shell electron configuration of 3d°4s°. Since no unpaired electron is present, it forms colourless compounds.

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