$A$ catalyst is used:

Which is True $(T)$ and False $(F)$ of the following statements?
$1.$ By catalyst,the forward reaction becomes fast and the reverse reaction becomes slow.
$2.$ $A$ catalyst decreases the potential energy of reactants and products.
$3.$ $A$ catalyst forms bonds in the reaction,so it is consumed.

Which of the following statements is $NOT$ true for a catalyst?

Which one of the following reactions is an example of heterogeneous catalysis?

The correct statements about Zeolites are:
$(I)$ They are good shape-selective catalysts.
$(II)$ They contain $Al-O-Si$ framework.
$(III)$ They are not found in nature.
$(IV)$ They are used as catalysts for cracking hydrocarbons in the petrochemical industry.

$A$ catalyst is a substance which