Crude oil, fuels and pollutants Quiz
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5 questions, one answer each
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1. Which process turns C₁₂H₂₆ into C₈H₁₈ and C₂H₄?
- A. Reforming
- B. Cracking
- C. Fractional distillation
- D. Complete combustion
2. Why is carbon monoxide toxic?
- A. It forms an acid in the lungs
- B. It is a greenhouse gas
- C. It binds to haemoglobin more strongly than oxygen
- D. It reacts with nitrogen in the blood
3. Which pair of gases causes acid rain?
- A. CO and CO₂
- B. C and CO
- C. CH₄ and C₂H₆
- D. SO₂ and NO₂
4. What is the main change when hexane is reformed?
- A. Straight chains become branched or cyclic
- B. The chain becomes shorter
- C. Carbon dioxide forms
- D. Alkenes become alkanes
5. Why is bioethanol only approximately carbon neutral?
- A. It releases no CO₂ when burned
- B. Plants release CO₂ when they photosynthesise
- C. Fossil fuels are used in growing the crops and distilling the ethanol
- D. It burns incompletely