Which of the following compounds does not exhibit paramagnetism?

The 'spin only' magnetic moment value of $MO_4^{2-}$ is . . . . . $BM$. (Where $M$ is a metal having least metallic radii among $Sc, Ti, V, Cr, Mn$ and $Zn$).
(Given atomic number: $Sc=21, Ti=22, V=23, Cr=24, Mn=25$ and $Zn=30$)

Draw the structures of the geometrical isomers of $[Fe(NH_3)_2(CN)_4]^-$.

The number of geometric isomers for the complex $[Co(NO_2)_2(NH_3)_2]$ is .....

The two compounds pentaamminesulphatocobalt $(III)$ bromide and pentaamminesulphatocobalt $(III)$ chloride represent:

Which one of the following does not exhibit geometrical isomerism?