(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

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(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.