In the reaction 2SO_2 + O_2 xrightarrow[As_2O | vedclass

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Question

(B) In the contact process for the manufacture of $SO_3$,$Pt$ acts as a catalyst. $As_2O_3$ (Arsenic oxide) is present as an impurity in the reactant

Vedclass · Accepted Answer

Catalytic poison

Vedclass · Answer

(B) In the contact process for the manufacture of $SO_3$,$Pt$ acts as a catalyst. $As_2O_3$ (Arsenic oxide) is present as an impurity in the reactant gases. This $As_2O_3$ adsorbs on the surface of the $Pt$ catalyst,thereby reducing its catalytic activity. Therefore,$As_2O_3$ acts as a catalytic poison.

In the reaction $2SO_2 + O_2 \xrightarrow[As_2O_3]{Pt} 2SO_3$,$As_2O_3$ acts as a:

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