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

The magnetic moment of $Fe^{2+}$ is $B.M$.

The possible number of stereoisomers for $[Co(en)_2Cl_2]^+$ is

Indicate the number of unpaired electrons in $K_3[Fe(CN)_6]$ and $K_4[Fe(CN)_6]$.

The types of isomerism shown by $[Cr(NH_3)_5NO_2]Cl_2$ are:

Which of the following will have three stereoisomeric forms?
$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3[CoCl_2(C_2O_4)_2]$
$(iv)$ $[CoBrCl(en)_2]$