Q: Which one of the following Ni(II) complexes is diamagnetic and has tetrahedral geometry?
(a)[NiCl₄]²⁻
(b)[Ni(CO)₄]
(c)[Ni(NH₃)₄]²⁺
(d)[Ni(CN)₄]²⁻
Correct Answer: (b)
The correct answer is (c): [Ni(NH₃)₄]²⁺. Subject: Mathematics | Sub-topic: Geometry Note: This answer was determined through AI-based research. Verify against the official answer key when available.