What is the secondary valency of the central metal ion in tetraamminedichloroplatinum $(IV)$ chloride?

What is the number of $=N-OH$ groups present in dimethyl glyoximato?

The coordination number of $Fe$ and $Co$ in the complex ions,$[Fe(C_{2}O_{4})_{3}]^{3-}$ and $[Co(SCN)_{4}]^{2-}$ are respectively

An octahedral complex with the formula $CoCl_3 \cdot nNH_3$ upon reaction with excess of $AgNO_3$ solution gives $2$ moles of $AgCl$. Consider the oxidation state of $Co$ in the complex is '$x$'. The value of $x+n$ is . . . . .

Which of the following are examples of double salts?
$A$. $FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O$
$B$. $CuSO_4 \cdot 4NH_3 \cdot H_2O$
$C$. $K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
$D$. $Fe(CN)_2 \cdot 4KCN$
Choose the correct answer.

Which of the following ligands is not ambidentate?
$(P) = NO_3^-$,$(Q) = NO_2^-$,$(R) = CN^-$,$(S) = SCN^-$