Which of the following is an industrial fuel?

Options

A. Water gas
B. Producer gas
C. Coal gas
D. All of these

Answer

D

Explanation

They all consist of `CO` which is an important fuel because it evolves a considerable amount of heat when it burns in air:
`2CO + O_(2) rarr 2CO_(2), Delta_(C)H^(@) = -565 kJ mol^(-1)`
Water gas is a particularly good fuel, i.e., it has high calorific value, because both `CO` and `H_(2)` burn and evolve heat. Producer gas is a less efficient fuel than water gas (i.e., it has a lower calorific value) as only part of the gas will burn.