Which of the following statements is/are not correct ?A. A catalyst always increases the speed of a reaction.B. A catalyst does not take part in the reaction.C. A catalyst may affect the nature of the products formed.D. A catalyst is always an external substance added to the reaction mixture.

Which of the following statements is/are not correct ?A. A catalyst al

1.	Which of the following statements is/are not correct ?A. A catalyst always increases the speed of a reaction.B. A catalyst does not take part in the reaction.C. A catalyst may affect the nature of the products formed.D. A catalyst is always an external substance added to the reaction mixture.
Answer» Correct Answer - A::B::D A catalyst is a substance that may increase or decreases the speed of reaction, also it may be added from outside and sometimes may produced during the reaction. Correct Answer - A::B::D A catalyst is a substance that may increase or decreases the speed of reaction, also it may be added from outside and sometimes may produced during the reaction.