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  4. Platinised asbestos helps in the formation of SO3 form SO2 and O2. But, if even a small amount of As2O3 is present the platinised asbestos does not help in the formation of SO3. As2O3 acts here as a/an

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Q. Platinised asbestos helps in the formation of $SO_3$ form $SO_2$ 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 a/an

Surface Chemistry

Solution:

$2SO_2 + O_2 \xrightarrow[As_2S_3 \text{(Poison)}]{\text{Platinised asbestos(catalyst)}} 2SO_3$