iGCSE Chemistry 0620 Extended - 11.3 Fuels- Exam Style Questions Paper 2- New Syllabus
▶️ Answer/Explanation
First, raw petroleum crude oil must be separated into narrower hydrocarbon fractions based on boiling points via fractional distillation, yielding fuel oil (Stage 1). Next, the larger alkanes inside fuel oil are broken apart at high temperatures via cracking to create short unsaturated monomers like ethene (Stage 2). Finally, thousands of ethene monomers are chemically chained together through addition polymerisation to build poly(ethene) (Stage 3). This pathway matches row C.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
Kerosene (also called paraffin) is correctly used as jet fuel. Bitumen is used for road surfacing, not as a lubricant. Naphtha is used as a chemical feedstock (to make chemicals), not for home heating. Refinery gas is used as a fuel for heating and cooking, not for making chemicals. So only the pairing of kerosene with jet fuel in option C is completely correct.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
Correct Answer: C
Explanation: According to the syllabus (section 11.3):
– Bottled gas is from the refinery gas fraction, not naphtha. ❌
– Jet fuel is from the kerosene/paraffin fraction, not diesel oil. ❌
– The lubricating oil fraction is used for lubricants, waxes, and polishes. ✅
– Kerosene fraction is for jet fuel; waxes come from the lubricating fraction. ❌
✅ Substances used to make polishes are obtained from the lubricating fraction.