The number of optical isomers possible for $[Cr(C_{2}O_{4})_{3}]^{3-}$ is $.....$ .

Which among the following complexes has the maximum number of isomers?

$[Fe(NO_{2})_{3} Cl_{3}]$ and $[Fe(ONO)_{3} Cl_{3}]$ show

The total number of possible isomers for square planar $[Pt(Cl)(NO_2)(NO_3)(SCN)]^{2-}$ is:

Which of the following are paramagnetic?
$A$. $[NiCl_4]^{2-}$
$B$. $Ni(CO)_4$
$C$. $[Ni(CN)_4]^{2-}$
$D$. $[Ni(H_2O)_6]^{2+}$
$E$. $Ni(PPh_3)_4$
Choose the correct answer from the options given below:

The spin only magnetic moment value of $Cr(CO)_6$ is (in $BM$)