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D and F Block Elements question

2010 · Q112
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D and F Block Elements question

2010 · Q112

NEETChemistryD and F Block ElementsMCQ+4 / −1
Which of the following ions will exhibit colour in aqueous solutions?
  1. A
    La3+ (Z = 57)
  2. B
    Ti3+ (Z = 22)
  3. C
    Lu3+ (Z = 71)
  4. D
    Se3+ (Z = 21)
View written solutionFree

Correct answer: B

La3+ : 54 e– = [Xe]

Ti3+ : 19 e– = [Ar] 4s03d1 (Colour)

Lu3+ : 68 e– = [Xe] 4f14

Sc3+ : 18 e– = [Ar]

As ions which have unpaired electrons exhibit colour in solution.

Ti3+ has an outer electronic configuration of 4s03d1 , i.e., 1 unpaired electron. Thus its solution will be coloured.

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