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The crystal field splitting energy for Cr+3 ion in an octahedral field increases for the ligands I- , H2O, NH3, CN- and the order is such that:

Correct answer: A. I- < H2O < NH3 < CN-

  • A. I- < H2O < NH3 < CN-
  • B. CN- < I- < H2O < NH3
  • C. CN- < NH3 < H2O < I-
  • D. NH3 < H2O < I- < CN-

Explanation

This question asks for the order of ligand strength according to the spectrochemical series arranges ligands based on their ability to cause d-orbital splitting. The general trend is that halides are weak-field, oxygen donors are intermediate, nitrogen donors are stronger, and carbon donors are the strongest.

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About Transition Elements

Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.

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