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D and F Block Elements question

2010 · Q114
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D and F Block Elements question

2010 · Q114

NEETChemistryD and F Block ElementsMCQ+4 / −1
Which of the following ions has electronic configuration [Ar]3d6?
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)
  1. A
    Ni3+
  2. B
    Mn3+
  3. C
    Fe3+
  4. D
    Co3+
View written solutionFree

Correct answer: D

The electronic configuration of the given ions is :

Ni3+ : [Ar]3d74s0

Mn3+ : [Ar]3d44s0

Fe3+ : [Ar]3d54s0

Co3+ : [Ar]3d64s0

Thus, Co3+ is the ion with the desired configuration.

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