Question

Which of the following has diamagnetic character?

• A. $\left[ NiCl _{4}\right]^{2-}$
• B. $\left[ CoF _{6}\right]^{3-}$
• C. $\left[ Fe \left( H _{2} O _{6}\right)\right]^{2+}$
• D. $\left[ Ni ( CN )_{4}\right]^{2-}$

Answer 1

Answer: (D)

Ni in presence of $CN^{-}$

$[Ni^{2+}$ in presence of $CN ^{-}=[ Ar ]$



As $\left[ Ni ( CN )_{4}\right]^{2-}$ has no unpaired electron. It is diamagnetic.