Which of the following metals is used as a catalyst in the manufacture of sulphuric acid by the contact process?

What is shape-selective catalysis?

In the Haber process for the production of ammonia, $Al_2O_3$ is used as:

When $KMnO_4$ solution is added to hot oxalic acid solution,the decolorization is slow in the beginning but becomes instantaneous after some time. This is because

The term $Platforming$ is:

According to the adsorption theory of catalysis,the rate of reaction increases because: