[amp_mcq option1=”increases the rate of the reaction” option2=”decreases the rate of reaction” option3=”has no action on the rate of the reaction” option4=”none of the above” correct=”option1″]
The correct answer is A. A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Option B is incorrect because a catalyst increases the rate of a reaction, not decreases it.
Option C is incorrect because a catalyst does have an effect on the rate of a reaction, it just doesn’t undergo any permanent chemical change itself.
Option D is incorrect because a catalyst does exist and does have the effect described in option A.