A-LevelChemistryElectrochemistryFeb/Mar 2021Paper 1 Q181 Mark
NO, NO₂, CO and unburnt hydrocarbons are present in the exhaust gases of internal combustion engines. When catalytic converters are used to remove these compounds from the exhaust gases, redox reactions occur. What happens to each compound in the catalytic converter? NO NO₂ CO unburnt hydrocarbons A oxidised oxidised reduced oxidised B oxidised oxidised oxidised oxidised C reduced reduced oxidised oxidised D reduced reduced reduced reduced
ANO oxidised, NO₂ oxidised, CO reduced, unburnt hydrocarbons oxidised
BNO oxidised, NO₂ oxidised, CO oxidised, unburnt hydrocarbons oxidised
CNO reduced, NO₂ reduced, CO oxidised, unburnt hydrocarbons oxidised
DNO reduced, NO₂ reduced, CO reduced, unburnt hydrocarbons reduced
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The correct answer is C. This question tests the candidate's understanding of electrochemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
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