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C+H2O->CO+H2; CO+H2O->CO2+H2. Net reaction?

AC+H2O->CO+H2
BCO+H2O->CO2+H2
CC+2H2O->CO2+2H2
DC+CO2->2CO
Answer & Solution
Correct answer: C. C+2H2O->CO2+2H2
Adding both stages cancels intermediate CO and leaves carbon plus two water molecules forming CO2 and two hydrogen molecules.
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