Which statement is incorrect?

Which of the following statements are true about $[NiCl_4]^{2-}$?
$(a)$ The complex has tetrahedral geometry
$(b)$ Coordination number of $Ni$ is $2$ and oxidation state is $+4$
$(c)$ The complex is $sp^3$ hybridised
$(d)$ It is a high spin complex
$(e)$ The complex is paramagnetic

What will be the type of hybridization if the shapes are square planar,octahedral,and linear,respectively?

Among $[Co(CN)_4]^{4-}, [Co(CO)_3(NO)], XeF_4, [PCl_4]^{+}, [PdCl_4]^{2-}, [ICl_4]^{-}, [Cu(CN)_4]^{3-}$ and $P_4$,the total number of species with tetrahedral geometry is:

Addition of excess potassium iodide solution to a solution of mercuric chloride gives the halide complex

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