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A **ligand** in a coordination compound is best described as:
AA central metal ion
BAn anion or molecule that donates an electron pair to the central metal (Lewis base)
CThe counter-ion outside the coordination sphere
DOnly a halide ion
Answer & Solution
Correct answer: B. An anion or molecule that donates an electron pair to the central metal (Lewis base)
Ligands are Lewis bases — they donate lone pairs to the electron-deficient central metal (Lewis acid), forming coordinate bonds. They can be anionic (Cl⁻, CN⁻), neutral (NH₃, H₂O) or even cationic.
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