Solved previous year question from the OPSC OAS/OCS 2019 Preliminary Examination (General Studies), with the official answer key and a detailed explanation.
Question
Reformulated gasoline (Oxygenated fuel) with a 2 percent minimum oxygen content is required during the winter months in non-attainment areas for carbon monoxide. Which of the substances listed below may be added to fuel to render it oxygenated?
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Answer & Explanation
Correct answer: (B) Methyl tertiary butyl ether
Methyl tertiary butyl ether (MTBE) is commonly added to gasoline to increase its oxygen content, helping it burn more completely.
This reduces the emission of carbon monoxide (CO), especially in winter and in non-attainment areas (regions that do not meet air quality standards).
- Lead and benzene are harmful pollutants and are banned or strictly limited in fuels.
- Organic magnesium is not used to oxygenate fuels.
- Thus, the correct oxygenating additive is MTBE.
