question_answer

  (i) State the hybridisation and magnetic behaviour of . (Atomic number of Cr is 24) (ii) Which of the two is more stable and why?or (iii) What are the various factors affecting crystal field splitting energy?                                                                  [3 x 1]

Answer:

    (i) Oxidation number of Cr = 0 Cr (24) [Ar] 3d5 4s1 Cr (when complexing with CO) Electrons donated by ligands CO. Hybridisation d3sp3 Inner d-orbital complex Unpaired electron = zero Thus, diamagnetic in nature.                          [1] (ii)

Ligand          CN                   6 ON of Fe       +2	6 +3

For a given ion and ligand, greater the charge on the metal ion, greater the stability. Thus,                      [1] (iii) Various factor affecting crystal field splitting Nature of the ligand Which have been arranged in increasing field strength as  (b) Geometry of the complex values (of tetrahedral complex) is about 50% compared to  value of octahedral complex). (c) Nature of metal ion 3d :high spin 4d,5d,: low spin (d) Oxidation state of metal ion [1] Thus, greater the charge on metal ion, greater the value of .