Entry Exam Category: Graduate & Professional Program Admission Exams
Course: Praxis
Exam: Praxis Elementary Science 5005 Practice Test
Practice Question
Of the following gases, which is found in the atmosphere in the greatest concentration?
Answer Choices
- A: O2
- B: N2
- C: H2
- D: CO2
Correct Answer: B
Rationale: N2 ~78%. A: O2 ~21%. C: H2 trace. D: CO2 ~0.04%. Nitrogen dominant.