The ability of a catalyst to accelerate the chemical reaction is known as

Zeolites are:

Which one of the following acts as an autocatalyst during the titration of $KMnO_4$ and oxalic acid in the presence of dilute $H_2SO_4$?

Catalysts in the following reactions are:
$(I) CH_3COOCH_{3(l)} + H_2O_{(l)} \rightarrow CH_3COOH_{(aq)} + CH_3OH_{(l)}$
$(II) 2SO_{2(g)} + O_{2(g)} \rightarrow 2SO_{3(g)}$ (Contact Process)
$(III) 2SO_{2(g)} + O_{2(g)} \rightarrow 2SO_{3(g)}$ (Lead Chamber Process)
$(IV) N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}$ (Haber Process)

Reactions in $Zeolite$ catalysts depend on

What is the role of adsorption in heterogeneous catalysis?