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← ScienceWhich risk increases when temperature drops dramatically across a platinum catalyst?
A)Thermal shock induces surface cracking✓
B)Catalyst inhibits CO oxidation activity
C)Platinum undergoes phase transformation now
D)Equilibrium shifts toward adsorbed reactants
💡 Explanation
Decreasing temperatures subjects platinum to thermal gradients causing thermal shock to lead to surface cracking; because high stresses concentrate at grain boundaries; therefore cracking occurs rather than only phase transition because the drop is sudden.
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