Consider the shown crystal-field splitting diagrams. Select the one that fits ea
ID: 932944 • Letter: C
Question
Consider the shown crystal-field splitting diagrams. Select the one that fits each of the following descriptions (The diagrams do not indicate the relative magnitudes of .).
Part A)
a weak-field octahedral complex of Fe3+
a weak-field octahedral complex of
Part B)
a strong-field octahedral complex of Fe3+
a strong-field octahedral complex of
Part C)
a tetrahedral complex of Fe3+
a tetrahedral complex of
Part D)
a tetrahedral complex of Ni2+
a tetrahedral complex of
diagram (1) diagram (2) diagram (3) diagram (4)Explanation / Answer
ANSWER:
Part (A). Last Option is correct answer. That is DIAGRAM (4 )IS CORRECT ANSWER. Fe3+ is a d5 system i.e; Fe3+ has 5 electrons in d-orbitals. 3 elecrons in t2g and 2 electrons in eg in presence of weak field conditions. THE SET OF 3 DEGENERATE ORBITALS IS CALLED t2g AND THE SET OF 2 DEGENERATE ORBITALS IS CALLED eg.
(B) In strong field the electrons will not go to eg, these will be filled in t2g. Hence DIAGRAM (1) IS CORRECT ANSWER.
(C) The orbital energy diagram of tetrahedral complexes is reverse of Octahedral. That means in tetrahedral comlexes eg have lower energy than t2g. Hence DIGRAM (3) IS CORRECT ANSWER.
(D) Ni2+ has 8 elecrons in d-orbitals. Hence DIAGRAM (2) IS CORRECT ANSWER for Ni2+ tetrahedral complex.