1.

Consider the following complex [Co(NH_(3))_(5),CO_(3)]CiO_(4). The coordination number, oxidation number, number of d-electrons and number of unpaired d-electrons on the metal are respectively.

Answer»

6,3,6,0
7,2,7,1
7,1,6,4
6,2,7,3

Solution :`[CO(NH_(3))_(5)CO_(3)]ClO_(4)`. SINX monodentate ligands are attached to Co HENCE C.N. of Co=6.
O.N.`=x+5xx(0)+1xx(-2)+1xx(-1)=0therefore x=+3`, electronic configuration of `Co^(3+)[AR]3d^(6)4s^(0)` hence number of d electrons is 6. all d-electrons are paired due to strong ligand hence unpaired electron is zero.


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