1.

(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.

Answer»

SOLUTION :(a) Reaction between IODIDE and persulphate ions is given by `2l^(-) + S_(2)O_(B)^(2-) overset(FE(III))rarr I_(2) + 2SO_(4)^(2-)`
MECHANISM: (i) `2Fe^(3+) + 2I^(-) rarr 2Fe^(2+) + I_(2)`
(ii) `2Fe^(2+) + 2S_(2)O_(B)^(2-) rarr 2Fe^(3+) + 2SO_(4)^(2-)`
(b) (i) contact process: `V_(2)O_(5)`
(ii) Haber.s process: Finely divided : Fe
(iii) Decomposition of `KClO_(3): MnO_(2)`


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