An example of a double salt is:

$A$ complex has a composition corresponding to the formula $CoBr_2Cl \cdot 4NH_3$. What is the structural formula if conductance measurements show two ions per formula unit? Silver nitrate solution gives an immediate precipitate of $AgCl$ but no $AgBr$.

The coordination number of $Th$ in $K_4[Th(C_2O_4)_4(OH_2)_2]$ is
$(C_2O_4^{2-} = \text{Oxalato})$

The formula of the complex hydridotrimethoxyborate$(III)$ ion is:

Number of water molecules in Mohr's salt is

What is the number of moles of donor atoms present in one mole of oxalate ion?