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Which of the following statements correctly explains why [Ni(trien)]²⁺ is more stable than [Ni(en)]²⁺?
a) [Ni(trien)]²⁺ is more stable because trien is tetradentate and binds weakly to Ni²⁺. b) [Ni(en)]²⁺ is more stable because en is smaller and forms fewer chelate rings. c) [Ni(trien)]²⁺ is more stable because trien is tetradentate and forms multiple chelate rings, increasing stability and entropy. d) [Ni(en)]²⁺ is more stable because en is easily displaced by water molecules, while trien is not