The geometry of the cuprammonium ion $[Cu(NH_3)_4]^{2+}$ is:

Which of the following systems in an octahedral complex has the maximum number of unpaired electrons?

What type of hybridization is present in $Ni$ of $[Ni(Cl)_4]^{2-}$ and $[Ni(CN)_4]^{2-}$ respectively?

In solid $CuSO_4 \cdot 5H_2O$,copper is coordinated to:

According to Valence Bond Theory,the number of unpaired electrons present in $[MnCl_6]^{3-}$,$[Fe(CN)_6]^{3-}$ and $[Co(C_2O_4)_3]^{3-}$,respectively,are

From the magnetic behaviour of $[NiCl_4]^{2-}$ (paramagnetic) and $[Ni(CO)_4]$ (diamagnetic),choose the correct geometry and oxidation state.