JEE Main 2025 Chemistry question
From the magnetic behaviour of [NiCl4]2– (paramagnetic) and [Ni(CO)4] (diamagnetic), choose the correct geometry and oxidation state.
- (1)[NiCl4]2– : NiII, square planar; [Ni(CO)4] : Ni(0), square planar
- (2)[NiCl4]2– : NiII, tetrahedral; [Ni(CO)4] : Ni(0), tetrahedralCorrect
- (3)[NiCl4]2– : NiII, tetrahedral; [Ni(CO)4] : NiII, square planar
- (4)[NiCl4]2– : Ni(0), tetrahedral; [Ni(CO)4] : Ni(0), square planar
Answer: (2)
Solution
[NiCl4]2- is Ni2+ sp3 tetrahedral paramagnetic (2 unpaired e-). [Ni(CO)4] is Ni(0) sp3 tetrahedral diamagnetic.
Question ID VK-001736