When acidified $KMnO_4$ is added to hot oxalic acid solution,the decolourization is slow in the beginning,but becomes very rapid after some time. This is because :

Explain the shape selective catalysis by zeolites.

Explain the adsorption theory of heterogeneous catalysis.

Which catalyst is used in the reaction $2KClO_3 \to 2KCl + 3O_2$?

Iron $(III)$ catalyses the reaction between iodide and persulphate ions,in which
$A$. $Fe^{3+}$ oxidises the iodide ion
$B$. $Fe^{3+}$ oxidises the persulphate ion
$C$. $Fe^{2+}$ reduces the iodide ion
$D$. $Fe^{2+}$ reduces the persulphate ion
Choose the most appropriate answer from the options given below:

Shape-selective catalyst zeolite has a structure like ..........