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Which outcome reduces the reaction rate when high-temperature cracking of ethane to ethylene yields carbon particle formation at reactor walls?

A)Decreased chain propagation efficiency
B)Increased radical chain initiation
C)Homogeneous catalyst surface passivation
D)Enhanced conductive heat dissipation

💡 Explanation

Decreased chain propagation efficiency reduces reaction rates because carbon particles terminate radical chains through surface adsorption, lowering the radical concentration. Therefore, less ethylene production, rather than more, occurs because increased initiation or heat dissipation would usually accelerate the cracking rate.

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