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(a) What is a fuel ? Give five examples...

(a) What is a fuel ? Give five examples of fuels.
(b) What are the characteristics of an ideal fuel (or good fuel) ?
(c ) The calorific value and ignition temperature of fuel A are 55 kJ/g and `80^(@)C`, respectively. These values for fuel B are 80 kJ/g and `10^(@)C`, respectively. On burning, the fuel A produces `CO_(2)` and `H_(2)O` while the fuel B produces `CO_(2), CO` and `SO_(2)`. Give three points of relative advantages and disadvantages of these two fuels.

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Calorific value and ignition temperature of fuel X are 75 kJ/g and 20^(@)C respectively. These values for fuel Y are 50 kJ/g and 75^(@)C respectively. On burning, the fuel Y produces only CO_(2) while fuel X produces CO_(2) and CO. Which of the two is a better fuel ? Give two reasons to support your answer.