The coordination numbers of $Co$ and $Al$ in $[Co(Cl)(en)_2]Cl$ and $K_3[Al(C_2O_4)_3]$,respectively,are ($en =$ ethane$-1,2-$diamine).

Which of the following is a $\pi$-acid ligand?

Which of the following ligands is ambidentate?

If the addition of $AgNO_3$ to a solution of $Co(NH_3)_5Cl_3$ results in the precipitation of $AgCl$ corresponding to two ionizable chloride ions,it means that ..............

$A$ coordination compound of cobalt contains five ammonia molecules,one nitro group,and two chlorine atoms per cobalt atom. One mole of this compound produces three moles of ions in an aqueous solution. Reaction of this solution with excess $AgNO_3$ yields two moles of $AgCl$ precipitate. What is the ionic structure of this complex?

$A$ monodentate ligand has