Which of the following complexes possesses a meridional $(mer)$ isomer?

The correct order of the spin only magnetic moment of metal ions in the following low spin complexes,$[V(CN)_6]^{4-}$,$[Fe(CN)_6]^{4-}$,$[Ru(NH_3)_6]^{3+}$,and $[Cr(NH_3)_6]^{2+}$,is

The theoretical value of the magnetic moment of the complex ion $[Ni(Cl)_4]^{2-}$ is .......... $B.M.$

The ionization isomer of $[Cr(H_2O)_4Cl(NO_2)]Cl$ is

Which type of isomerism is exhibited by $[Cr(C_2O_4)_3]^{3-}$?

The electronic configurations of $Cr^{2+}$,$Mn^{2+}$,$Fe^{2+}$,and $Co^{2+}$ ions are $d^4$,$d^5$,$d^6$,and $d^7$ respectively. Which of the following complexes has the minimum paramagnetic character?