The type of isomerism present in pentaammine nitro chromium$(III)$ chloride is

The magnetic moment of $[Fe(H_2O)_6]^{3+}$ is $5.92 \ BM$,whereas the magnetic moment of $[Fe(CN)_6]^{3-}$ is $1.74 \ BM$. Explain why.

What is the reason for the deviation between the experimental and theoretical values of magnetic moment?

Compound	Total stereoisomers
$A$. $[Co(en)_2Cl_2]^+$	$P$. $2$
$B$. $[Co(en)_3]Cl_3$	$Q$. $3$
$C$. $[Pt(NH_3)_2Cl_2]$	$R$. $4$
$D$. $[Pt(NH_3)_3Cl_3]^+$	$S$. $5$

Match the compounds with their total number of stereoisomers and select the correct code:

$A$ complex of the type $[M(AA)_{2}X_{2}]^{n+}$ is known to be optically active. What does this indicate about the structure of the complex? Give one example of such a complex.

$[Co(NH_3)_4Cl_2]NO_2$ and $[Co(NH_3)_4Cl.NO_2]Cl$ are $........$ isomers.