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How iron (III) catalyses the reaction be...

How iron `(III)` catalyses the reaction between iodide & persulphate ?

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`2I^(-) +S_(2)O_(8)^(2+) to I_(2) +2SO_(4)^(2-)`
`2 Fe^(3+) + 2I^(-) to 2Fe^(2+)+I_(2)`
`2Fe^(2+) +S_(2)O_(8)^(2-) to 2Fe^(3+) + 2SO_(4)^(2-)`
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Assertion : Iron(III) catalyses the reaction between iodide and persulphate ions. Reason : Transition metals act as catalysts.

(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.

Which of the following transition metal ion catalyses the reaction between iodide and persulphate ions?

Which one of the following catalyses the reaction between iodide and persulphate ions (2I^(-) + S_(2)O_(8)^(2-) rarr I_(2) + 2SO_(4)^(2-))

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