Discussion
Assertion (A): An endothermic reactor is usually limited by heat supply rather than by kinetics.
Reason (R): The reaction cools itself, so the temperature falls unless heat is supplied at the rate the reaction consumes it.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. Because the reaction consumes heat, the temperature and therefore the rate fall unless heat is supplied at least as fast as the reaction takes it. The design problem becomes one of heat transfer rather than of kinetics, which is why steam reforming and ethane cracking are done in fired tubes of small diameter - the geometry is chosen to get heat in.
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