Q.

Which of the following is the best fuel in terms of energy released per gram of fuel?

A. Hydrogen
B. Methane
C. Ethanol
D. Butane
Answer» A. Hydrogen
Explanation: The amount of energy released increases with the number of bonds present in the chemical substance or fuel. That is because each bond has a certain amount of energy stored in it therefore the more bonds the more energy is stored and more energy is released if these bonds break through combustion. Theoretical values of
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