Coordination CompoundHard

Question

Which of the following statement(s) is /are correct ?

Options

A.In K3[Fe(CN)6], the ligands has satisfied only the secondary valencies of ferric ion.
B.In K3[Fe(CN)6], the ligands has satisfied both primary and secondary valencies of ferric ion.
C.In K4[Fe(CN)6], the ligands has satisfied only the secondary valencies of ferrous ion.
D.In [Cu(NH3)4]SO4, the ligands has satisfied only the secondary valencies of copper.

Solution

K3[Fe(CN)6] ; Coordination number (i.e. secondary valencies) of Fe3+ is 6 which are satisfied by negatively charged ligands, CN- and primary valencies (i.e. oxidation state) of iron is 3 which are also satisfied by negatively charged ligands, CN-.
K4[Fe(CN)6] ; Coordination number (i.e. secondary valencies) of Fe2+ is 6 which are satisfied by negatively charged ligands, CN- and primary valencies (i.e. oxidation state) of iron is 2 which are also satisfied by negatively charged ligands, CN-.
[Cu(NH3)4]SO4; Coordination number (i.e. secondary valencies) of Cu2+ is 4 which are satisfied by neutral ligands, NH3. The primary valencies of Cu2+ are not satisfied by neutral ligands, NH3.

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