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Question

The complex for which the calculation of crystal field splitting can be most easily done, by knowing its absorption spectrum, will be :


A

[CoF6]-3

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B

[TiCl6]2-

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C

[Ti(CN)6]3-

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D

[Fe(H2O)6]2+

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Solution

The correct option is C

[Ti(CN)6]3-


The explanation for the correct answer:-

Option (C) [Ti(CN)6]3-

  • This, Ti+3 ion has one electron in a 3d subshell.
  • Since its configuration is 3d24s2.
  • Due to charge, it will lose three electrons from the valence shell.
  • Thus it is one electron complex.

The explanation for incorrect answer:-

Option (A) [CoF6]-3 .

  • In this complex, cobalt will have 4 unpaired electrons so, the calculation will be difficult.
  • Thus it is incorrect.

Option (B) [TiCl6]2-

  • In this, Titanium will have no electron in the 3d shell, so there will be no absorption spectrum.
  • Thus it is incorrect.

Option (D) [Fe(H2O)6]2+

  • In this also ferrous has 4 unpaired electrons, the calculation will be difficult.
  • Thus it is incorrect.

Therefore, the correct option is (c) [Ti(CN)6]3-.


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