The decomposition of $H_2O_2$ can be slowed down by the addition of a small amount of phosphoric acid,which acts as:

In the contact process for the manufacture of $H_2SO_4$, the arsenic purifier used in the industrial plant contains:

In the oxidation of oxalic acid by $KMnO_4$,the color of $KMnO_4$ disappears slowly at the start of the reaction but disappears very fast afterwards. This is an example of:

In which of the following processes does shape-selective catalysis occur?

Which among the following can be explained by adsorption theory?

Two percent of ethanol is added during the oxidation of chloroform to stop the formation of carbonyl chloride. In this reaction,ethanol acts as: