Paramagnetic coordination compounds contain ........ electrons.

Choose the complexes which are paramagnetic from the following:
$(i)$ $K_4[Fe(CN)_6]$
(ii) $K_3[Cr(CN)_6]$
(iii) $K_3[Fe(CN)_6]$
(iv) $K_2[Ni(CN)_4]$

Out of the following two coordination entities,which is chiral (optically active)?
$(a)$ $cis-[CrCl_{2}(ox)_{2}]^{3-}$
$(b)$ $trans-[CrCl_{2}(ox)_{2}]^{3-}$

The $[Cr(NH_3)_6]^{3+}$ ion is ...

Which of the following complex ions is diamagnetic in nature?

How many geometrical isomers are possible for the complex $[Ma_3b_3]^{\pm n}$?