Which is an example of a heterogeneous catalyst?
a amylase

b catalytic converter

c food preservatives

d amino acids

b.catalytic converter is correct option.

Explanation:

Heterogeneous catalysts: In this catalyst phase is different from the phase of the reactants. In heterogeneous catalysis, reactants are in the gas phase and solid phase catalysts are involved.The catalytic converter is a example of heterogeneous catalysts,In which palladium, rhodium are used as hetrogenous catalysts.The catalytic converter is used to decrease the toxic gases with the process of a redox reaction.The catalytic converter uses a catalyst to carry the reaction. The catalytic converter used in gasoline is the example of heterogeneous catalysis.catalytic converter by oxidation process converts the carbon monoxide gas into carbon dioxide.

C: plants and animals