Paper 1 · People, Development and Environment
Which of the following gases has the highest calorific value?
AButane
BMethane
CEthane
DHydrogen ✓ Correct
Correct answer: (D) Hydrogen — Hydrogen has the highest calorific value, so that is the answer.
Explanation
★Hydrogen has the highest calorific value, so that is the answer.
★Calorific value is the heat released when a fuel burns.
★Hydrogen releases more heat per unit mass than the other gases.
★So hydrogen has the highest calorific value.
★Butane, methane and ethane give less heat per unit mass.
★So the answer is hydrogen.
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