Write down the use of $ZSM-5$.

Which catalyst is used in the oxidation of $SO_2$ to $SO_3$?

In which of these processes is platinum used as a catalyst?

$A$ catalyst is a substance which

Which of the following statements is incorrect?

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: