Multiple choice

Which of the following complexes are diamagnetic in nature? (1) [CoF6]3-
(2) [Fe(CN)6]4-
(3) [Ni(CN)4]2-
(4) Zn(H2O)6]2+
(5) [Cr(H2O)6]3+

  1. 1, 2 and 3 only

  2. 2, 3 and 4 only

  3. 3, 4 and 5 only

  4. 1 and 5 only

  5. 3 and 5 only
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

[Fe(CN)6]4- is an inner orbital complex with octahedral geometry (d2sp3 hybridisation); no unpaired electrons; diamagnetic [Ni(CN)4]2- is an inner orbital complex with square planar geometry (dsp2 hybridisation); no unpaired electrons; diamagnetic Zn(H2O)6]2+ is an outer orbital complex with square planar geometry (sp3d2 hybridisation); no unpaired electrons; diamagnetic

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