The shape of the manganate ion $(MnO_4^{2-})$ is . . . . . . .

In which of the following configurations will there be the possibility of both paramagnetism and diamagnetism,depending on the nature of the ligands?

What is the geometry of the $[Ni(CO)_4]$ complex?

The complex ion $[Cu(NH_3)_4]^{2+}$ has which of the following geometries and electronic configurations?

The number of unpaired electrons in $[NiCl_{4}]^{2-}$, $Ni(CO)_{4}$ and $[Cu(NH_{3})_{4}]^{2+}$ respectively are

According to valence bond theory,the metal atom or ion can make use of which of the following orbitals to yield hybrid orbitals that can form bonds with ligands?