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← ScienceWhich outcome occurs when a powdered catalyst is inadequately mixed in an exothermic reactor?
A)Thermal runaway accelerates uncontrollably.✓
B)Reaction rate becomes mass-transfer limited.
C)Selectivity shifts toward undesired products.
D)Equilibrium shifts favor reactants.
💡 Explanation
Inadequate mixing causes localized hotspots because heat removal is insufficient; therefore, thermal runaway accelerates uncontrollably as the reaction rate spikes exponentially with temperature, rather than slower mass-transfer bottlenecks with greater catalyst dispersion.
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