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(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?
(b) Mention any three processes where transition metals act as catalysts?
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(a) Reaction between and persulphate ions is $2 \mathrm{I}^{-}+\mathrm{S}_2 \mathrm{O}_8^{2-} \stackrel{\mathrm{Fe}(\mathrm{III})}{\longrightarrow} \mathrm{I}_2+2 \mathrm{SO}_4^{2-}$
Role of Fe(III) ions:
Thus, $\mathrm{Fe}^{3+}$ oxidises I ions to iodine.
(b) (i) $\mathrm{V}_2 \mathrm{O}_5$ catalysis the oxidation of $\mathrm{SO}_2$ to $\mathrm{SO}_3$ in contact process.
(ii) Finely divided iron in Haber's process in conversion of $\mathrm{N}_2$ and $\mathrm{H}_2$ to $\mathrm{NH}_3$.
(iii) $\mathrm{MnO}_2$ in preparation of oxygen from $\mathrm{KClO}_3$.
Role of Fe(III) ions:
Thus, $\mathrm{Fe}^{3+}$ oxidises I ions to iodine.
(b) (i) $\mathrm{V}_2 \mathrm{O}_5$ catalysis the oxidation of $\mathrm{SO}_2$ to $\mathrm{SO}_3$ in contact process.
(ii) Finely divided iron in Haber's process in conversion of $\mathrm{N}_2$ and $\mathrm{H}_2$ to $\mathrm{NH}_3$.
(iii) $\mathrm{MnO}_2$ in preparation of oxygen from $\mathrm{KClO}_3$.
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