The calculated magnetic moment value for the $Fe^{2+}$ ion in $BM$ is:

The diamagnetic species is

Select the incorrect match.

Which of the following pairs of complexes have the same magnetic moment,same hybridisation,and same $EAN$ value?

The coordination number,oxidation number,number of electrons in $d$-orbital,and number of unpaired electrons respectively in the complex $[Co(NH_3)_4CO_3]ClO_4$ are . . . . . . .

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