Which of the following is a basic ligand?

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(D) In coordination chemistry,a ligand is an ion or molecule that acts as a Lewis base by donating a pair of electrons to a central metal atom to form

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All of these

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(D) In coordination chemistry,a ligand is an ion or molecule that acts as a Lewis base by donating a pair of electrons to a central metal atom to form a coordination complex.$NH_3$ has a lone pair on the nitrogen atom.$CN^{-}$ has a lone pair on the carbon atom.$F^{-}$ has lone pairs on the fluorine atom.Since all these species can donate an electron pair to a metal center,they all act as Lewis bases (ligands).

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