" A catalyst is a substance which "

A catalysts is a substance which :

A catalyst is a substance that :

In the reversible reaction a catalyst is the substance which

underline("Catalyst is a substance which alters ") the equilibrium constant of reaction

Correct the following statements by changing the underlined part of the sentence (Do not change the whole sentence) ul("Catalyst is a substance which alters ") the equilibrium constant.

Read the given passage and answer the questions A substance which alters the rate of chemical reaction without undergoing any change in mass and chemical composition at the end of reaction is called catalyst. It may be noted that catalyst which increases the speed of a reaction is called positive catalyst and catalyst which decrease the speed of reaction is called negative catalyst. The promoters are substances that enhance the activity of catalyst and poisons are the substances which decrease the activity of catalyts. How many types of catalysts are there ?