GS PrelimsScience and TechnologyInnovation in Energy Technology1997

Which one of the following has the highest fuel value?

Hydrogen

Charcoal

Natural Gas

Gasoline

Correct Answer: Option A

Explanation

1. Fuel value, or calorific value, refers to the amount of energy released per unit mass (or sometimes per unit volume) when a substance undergoes complete combustion. 2. Comparing the approximate higher heating values per unit mass for the given options: - Hydrogen (H2): ~142 MJ/kg - Charcoal (largely Carbon): ~30 MJ/kg - Natural Gas (mainly Methane, CH4): ~55 MJ/kg - Gasoline (complex hydrocarbon mixture): ~46 MJ/kg 3. Based on these values, Hydrogen has the highest fuel value per unit mass among the choices provided.

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