AAMC 8 Physical Sciences, Question 40

[Natasha1989]

40. According to the information in the passage, the gas that evolves is:

a) sulfur dioxide
b) sulfur trioxide
c) carbon dioxide
d) carbon monoxide

How is the answer c?

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[UMICHPremed]

Adding a strong acid to CO3- makes H2CO3 (remember the blood buffer system?). Subsequently H2CO3 dissociates into CO2 and H2O (try to relate physiology and chemistry).