Practice Quiz

MCAT Biology

Category - Chemistry

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Which of the following statements explains why oxygen is classified asa pure substance and air is classifiedas a mixture?
  1. Oxygen is more reactive than air.
  2. Oxygen has a higher density than air.
  3. Oxygen undergoes phase changes, whereas air is always a gas.
  4. Oxygen contains only one substance, but air contains several substances.
Explanation
Answer: D - Oxygen contains only one substance, but air contains several substances.
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