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Which 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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