Question

Among the following, which one is paramagnetic and has tetrahedral geometry?

• A. $[Ni(CN{)}_4{]}^{2-}$
• B. $[NiC{l}_4{]}^{2-}$
• C. $[Ni(CO{)}_4]$
• D. $[COC{l}_2(en{)}_2{]}^{+}$

Answer 1

Answer: (B)

$[NiC{l}_4{]}^{2-}$ has tetrahedral geometry due to $s{p}^3$ hybridization. It contain two unpaired electron hence it is paramagnetic in nature.