The cyanide ion is very toxic to humans because it binds with iron (Fe³⁺)in what enzyme to form a stable complex that stops cellular respiration.

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The cyanide ion binds with iron in cytochrome oxidase, an enzyme crucial for the final step in the electron transport chain of cellular respiration. This binding inhibits the enzyme, preventing cells from producing ATP, leading to cellular and organismal death.

The Cyanide Ion Is Very Toxic to Humans Because It