Fractional distillation and cracking Quiz
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5 questions, one answer each
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1. What is the main reason for the different fractions condensing at different heights in a fractionating column?
- A. The molecules have different numbers of C=C bonds
- B. The molecules have different boiling points because of different London forces
- C. The molecules react differently with the column
- D. The molecules are ionic
2. Which are the conditions for thermal cracking?
- A. Slight pressure, 450 °C, zeolite catalyst
- B. Slight pressure, low temperature
- C. High pressure, no heat
- D. High pressure and high temperature
3. Which statement gives an economic reason for cracking?
- A. Demand for short-chain alkanes is greater than the supply from distillation
- B. Cracking makes crude oil cheaper to buy
- C. Cracking removes all alkenes
- D. Alkanes cannot be burned unless cracked
4. C₁₂H₂₆ is cracked into C₈H₁₈, C₂H₄ and one other product. What is the other product?
- A. C₄H₁₀
- B. C₂H₆
- C. C₂H₄
- D. C₁₂H₂₆
5. Which are the main products of catalytic cracking?
- A. Alkenes only
- B. Polymers
- C. Motor fuels and aromatic hydrocarbons
- D. Refinery gas only