2015 First Aid Exam No. 4 Taken from the 2015 Missouri S&T First Aid Contest held in Rolla, Missouri Progress Indicator: Question 7 of 30 7.  Asphyxiating gases: Choices: Can, in all cases, be tasted, smelled, or seen Cause suffocation Cause the metal parts of an apparatus to corrode Do not produce an oxygen deficient atmosphere