MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

In a complex compound, the central metal ion accepts one or more electron pairs from the surrounding ligands to form coordinate covalent bonds. According to the Lewis theory of acids and bases, an electron pair acceptor is defined as a Lewis acid, while an electron pair donor is defined as a Lewis base. Therefore, the central metal ion acts as a Lewis acid. Answer: Lewis acid