Question detail
What is crude oil primarily composed of?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Carbon compounds as fuels and feedstock
Question
- A. Ancient biomass consisting mainly of plankton
- B. Minerals and metals
- C. Water and sand
- D. Living organisms
Answer
The correct option is Ancient biomass consisting mainly of plankton.
Explanation
The correct option is Ancient biomass consisting mainly of plankton. Ancient biomass consisting mainly of plankton is correct because it directly supports the approved learning objective to explain that crude oil is the remains of an ancient biomass consisting mainly of plankton buried in mud. This belongs to Crude oil, hydrocarbons and alkanes within Carbon compounds as fuels and feedstock, so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Misunderstanding Crude Oil Formation
Students often think that crude oil is formed from just any organic material rather than specifically from ancient plankton buried in mud.
Emphasize that crude oil specifically originates from the remains of ancient biomass, primarily plankton, which were buried in mud over millions of years.
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