Answer:
A) [Fe(CN)₄(CO)₂]²⁻: coordination number = 6.
B) [Cr(EDTA)]⁻: coordination number = 6.
C) [Zn(NH₃)₄]²⁺: coordination number = 4.
D) [Ag(NH₃)₂]NO₃: coordination number = 2.
Explanation:
A) [Fe(CN)₄(CO)₂]²⁻:
In this complex, Fe is bonded with 4 molecules of CN (with 4 coordinate bonds, one bond for each molecule) and 2 molecules of CO (with 2 coordinate bonds, one bond for each molecule) forming the complex with 6 coordinate bonds.
coordination number = 6.
B) [Cr(EDTA)]⁻:
In this complex, Cr is bonded with 1 molecules of EDTA (with 6 coordinate bonds, 4 O atoms and 2 N atoms in EDTA molecule).
coordination number = 6.
C) [Zn(NH₃)₄]²⁺:
In this complex, Zn is bonded with 4 molecules of NH₃ (with 4 coordinate bonds, one bond for each molecule).
coordination number = 4.
D) [Ag(NH₃)₂]NO₃:
In this complex, Ag is bonded with 2 molecules of NH₃ (with 2 coordinate bonds, one bond for each molecule).
coordination number = 2.
