A Levels Chemistry (9701)•9701/13/O/N/20
Explanation
Products of PVC Combustion
Steps:
- PVC is poly(vinyl chloride), with repeating unit C₂H₃Cl.
- Complete combustion reacts with O₂ to form CO₂, H₂O, and HCl: C₂H₃Cl + 2.5O₂ → 2CO₂ + H₂O + HCl.
- Products include CO₂ (greenhouse gas), H₂O, and HCl (acidic, hazardous).
- Evaluate options against these products.
Why A is correct:
- CO₂, a product, is a greenhouse gas that traps heat and contributes to global warming per climate science definitions.
Why the others are wrong:
- B: HCl is also produced, not just CO₂ and H₂O.
- C: HCl reacts with water to form acidic HCl(aq), not alkaline.
- D: HCl is hazardous and corrosive, requiring exhaust gas treatment.
Final answer: A
Topic: Polymerisation
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