Q. An exothermic chemical reaction occurs in two steps as follows $(I)\ A + B \rightarrow X\$(fast) $(II)\ X \rightarrow AB\$(slow) The progress of the reaction can be best represented by
A) [image:4_image16.emf]
B) [image:4_image17.emf]
C) [image:4_image18.emf]
D) All are correct
Explanation
(c)
The reaction occurring in two steps has two activation energy peaks. The first step, being fast needs less activation energy. The second step being slow, needs more activation energy. Therefore, second peak will be higher than the first
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.