A-LevelChemistryReaction kinetics9701/12 · Feb/Mar 2019 · Q341 Mark
Some polluting gases are removed from car exhaust fumes using a catalytic converter. Platinum or palladium can be used as the catalyst. The reactions are faster when platinum is the catalyst than they are when palladium is the catalyst. Which statements are correct? 1 Platinum acts as a heterogeneous catalyst in these reactions. 2 The palladium-catalysed reactions have higher activation energies than the platinum-catalysed reactions. 3 The platinum-catalysed reactions are more exothermic than the palladium-catalysed reactions.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
B: 1 and 2 only are correct
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