Discussion
Which gas is known as "Fuel of Future" ?
Answer: D
Hydrogen is called the fuel of the future.
It has the highest energy content per unit mass of any fuel, about \(142\ \mathrm{kJ\,g^{-1}}\), and its only combustion product is water: \[\mathrm{2H_2 + O_2 \rightarrow 2H_2O}\] The obstacles are producing it without fossil fuels and storing a gas of such low density safely.
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