Catalyst

Which one of the following statements about enzyme catalysis is incorrect?

1.	Enzymes are mostly proteinous in nature.
2.	Enzyme action is specific.
3.	Enzymes are denaturized by ultraviolet rays at high temperatures.
4.	Enzymes are least reactive at an optimum temperature.

The incorrect statement among the following is:

1.	The value of the equilibrium constant is changed in the presence of a catalyst.
2.	Enzymes catalyze mainly bio-chemical reactions.
3.	Coenzymes increase the catalytic activity of the enzyme.
4.	The catalyst does not initiate any reaction.

The incorrect statement regarding enzymes is:

1.	Enzymes are very specific for a particle reaction and substrate.
2.	Enzymes are biocatalysts.
3.	Like chemical catalysts, enzymes reduce the activation energy of bio processes.
4.	Enzymes are polysaccharides.

Which one is an example of heterogeneous catalysis?

1.	Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.
2.	Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen.
3.	Hydrolysis of sugar catalysed by H+ ions.
4.	Decomposition of ozone in presence of nitrogen monoxide.