$(a)$ 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.
$(a)$ 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.
$(a)$ Reaction between iodide and persulphate ions is given by $2 \mathrm{I}^{-}+\mathrm{S}_{2} \mathrm{O}_{8}^{2-} \stackrel{\mathrm{Fe}(\mathrm{III})}{\longrightarrow} \mathrm{I}_{2}+2 \mathrm{SO}_{4}^{2-}$
Mechanism :
$(i)$ $2 \mathrm{Fe}^{3+}+2 \mathrm{I}^{-} \rightarrow 2 \mathrm{Fe}^{2+}+\mathrm{I}_{2}$
$(ii)$ $2 \mathrm{Fe}^{2+}+2 \mathrm{~S}_{2} \mathrm{O}_{8}^{2-} \rightarrow 2 \mathrm{Fe}^{3+}+2 \mathrm{SO}_{4}^{2-}$
$(b)$ $(i)$ Contact process : $\mathrm{V}_{2} \mathrm{O}_{5}$
$(ii)$ Haber's process : Finely divided : Fe
$(iii)$ Decomposition of $\mathrm{KClO}_{3}: \mathrm{MnO}_{2}$
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The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products $\mathrm{A}$ and $\mathrm{B}$ along with the evolution of $\mathrm{CO}_2$. The sum of spin-only magnetic moment values of $A$ and $B$ is .......... $B.M.$ (Nearest integer)
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- [JEE MAIN 2024]
Which have melting point below $500\,^{\circ} C$.
Which have melting point below $500\,^{\circ} C$.
- [AIIMS 2019]