Question

Which of the following statement is incorrect?

Options

• \[\ce{[NiCl4]^{2-}}\] is paramagnetic.

• \[\ce{[Ni(CO)4]}\] is diamagnetic.

• \[\ce{[Cr(NH3)6]^{3+}}\] is paramagnetic.

• \[\ce{[Ni(CN)4]^{2-}}\] is paramagnetic.

Answer 1

\[\ce{[Ni(CN)4]^{2-}}\] is paramagnetic.

Explanation:

\[\ce{[Ni(CN)4]^{2-}}\] is diamagnetic not paramagnetic.

Ni atom (Z = 28) (ground state) = \[\ce{[Ar] 3d^8, 4s^2, 4p^0}\]

CN^- is a strong field ligand, due to which pairing of electron takes place.