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(a) Transition metals can act as cataly...

(a) Transition metals can act as catalysts because these can change their oxidation state. How does Fe (III) catalyse the reaction between iodide and persulphate ions?
(b) Mention any three processes where transition metals act as catalysts.

Text Solution

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(a) The catalyst reaction may be described as follows:
`underset("(Reactant)")(2I^(-))+ underset("(Catalyst)")(2F3^(3+)) to underset("(Intermediate)")(2Fe^(2+))+I_(2)`
`2Fe_(2)+ underset("(Reactant)")((S_(2)O_(8))^(2-)) to underset("(Catalyst)")(2Fe^(3+))+2SO_(4)^(2-)`
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