alleryStart learning →A metal ion binding several cyanide ligands is best described in Lewis terms as the:
ALewis adduct
BCommon ion
CLewis acid
DLewis base
Answer & Solution
Correct answer: C. Lewis acid
1. Complex formation is a case of Lewis acid-base chemistry.
2. Reactions involving the formation of coordinate covalent bonds are Lewis acid-base chemistry.
3. The species donating the electron pair is a Lewis base.
4. Cyanide ligands are the donors here, so they act as Lewis bases.
5. The metal ion accepts those electron pairs, so it is the Lewis acid.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 15 'Equilibria of Other Reaction Classes', sections 15.1-15.3_
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