What is the type of magnetic behavior and geometry respectively in Cuproammonium sulphate (Atomic no. of $Cu=29$)?

How many unpaired electrons are present in the central metal ion of $[CoCl_4]^{2-}$?

$FeSO_4$ is a very good absorber for $NO$. The new compound formed by this process is found to contain what number of unpaired electrons?

The coordination complex $[Co(OH_2)_6]^{2+}$ has one unpaired electron. Which of the following statements are true?
$(i)$ The complex is octahedral.
$(ii)$ The complex is an outer orbital complex.
$(iii)$ The complex is diamagnetic.

Nickel $(Z = 28)$ combines with a uninegative monodentate ligand to form a diamagnetic complex $[NiL_4]^{2-}$. The hybridisation involved and the number of unpaired electrons present in the complex are respectively

$K_3[CoF_6]$ is a high-spin complex. The hybridization state of $Co$ in this complex is .....................