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(D) In the contact process for the manufacture of $H_2SO_4$,platinised asbestos acts as a catalyst for the oxidation of $SO_2$ to $SO_3$. $As_2O_3$ (a

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$A$ poison

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(D) In the contact process for the manufacture of $H_2SO_4$,platinised asbestos acts as a catalyst for the oxidation of $SO_2$ to $SO_3$. $As_2O_3$ (arsenic oxide) present as an impurity acts as a catalytic poison,which binds to the active sites of the catalyst and reduces its efficiency. $2SO_2 + O_2 \xrightarrow[As_2O_3 	ext{ (poison)}]{	ext{Platinised asbestos (catalyst)}} 2SO_3$

Platinised asbestos helps in the formation of $SO_3$ from $SO_2$ and $O_2$. But,if even a small amount of $As_2O_3$ is present,the platinised asbestos does not help in the formation of $SO_3$. $As_2O_3$ acts here as

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