Platinized asbestos is used as a catalyst in the manufacture of $H_2SO_4$. It is an example of

$A$ catalyst is a substance which

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:

Which of the following reactions requires a catalyst?

The term $Platforming$ is:

What is used as a catalyst in the Wacker process?