Discussion
Assertion (A): A reaction that is easily controlled in the laboratory can run away at plant scale.
Reason (R): The heat transfer area per unit volume falls as the vessel is made larger.
Answer: B
Both are true and the reason gives the mechanism: the same reaction generates heat in proportion to volume while the cooling capacity grows only with area, which is the classic scale-up hazard. Calorimetry is what settles the question in advance.
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