A) 6, 3, 6, 0
B) 7, 2, 7, 1
C) 7, 1, 6, 4
D) 6, 2, 7, 3
Correct Answer: A
Solution :
[a] \[[Co{{(N{{H}_{3}})}_{5}}C{{O}_{3}}]Cl{{O}_{4.}}\] Six monodentate ligands are attached to Co hence C. N. of Co=6; \[O.N.=x+5\times (0)+1\times (-2)+1\times (-1)=0\] \[\therefore \] \[x=+3;\] electronic configuration of\[C{{o}^{3+}}[Ar]\,\,3{{d}^{6}}4{{s}^{0}}\]hence number of d electrons is 6 : All d electrons are paired due to strong ligand hence unpaired electrons zero.
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