C. Number of ionic bonds
D. All of these
Q4. The number of unpaired electrons in the complex ion [tex]$\left[\left. CoF _6\right|^3\right.$] is
A. 3
B. 2
C. 4
D. 0
Q5. Among [tex]$[ Ni ( CO ) 4]$[/tex], [tex]$\left[ Ni \left( NH _3\right) 4\right]$[/tex], and [tex][tex]$[ Ni ( Cl ) 4]^2$[/tex][/tex] species, the oxidation states of the Ni atom are, respectively,
A. [tex]$0, +3, +2$[/tex]
B. [tex]$0, 0, +2$[/tex]
C. [tex]$+2, +3, 0$[/tex]
D. [tex]$+2, 0, +3$[/tex]