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D and F Block Elements question

2000 · Q101
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D and F Block Elements question

2000 · Q101

NEETChemistryD and F Block ElementsMCQ+4 / −1
Which ion is colourless?
  1. A
    Cr4+
  2. B
    Se3+
  3. C
    Ti3+
  4. D
    V3+
View written solutionFree

Correct answer: B

If the transition metal ion has unpaired electron then it shows colour.

Sc3+ : [Ar]18 3d04s0

Ti3+ : [Ar]18 3d14s0

Cr4+ : [Ar]18 3d24s0

V3+ : [Ar]18 3d24s0

Hence, Sc3+ do not contain unpaired electron and hence it will not undergo d – d transition and do not show colour.

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