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← ScienceWhich risk increases when exceeding a catalyst poison threshold?
A)Reaction equilibrium severely changes
B)Uncontrolled runaway exothermic reaction✓
C)Catalyst surface area marginally increases
D)Overall activation energy decreases swiftly
💡 Explanation
When poison concentration surpasses a threshold catalyst deactivation occurs, thereby lowering the rate of heat removal because the effective catalyst surface area is reduced, therefore a runaway reaction can initiate rather than reach equilibrium at operating temperatures.
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