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A 'good' or 'ideal' fuel should have ALL of the following properties EXCEPT:
AHigh calorific value
BModerate rate of burning, easy to store and transport, cheap
CShould not leave harmful residues or gases
DShould explode unpredictably to release energy quickly
Answer & Solution
Correct answer: D. Should explode unpredictably to release energy quickly
An unpredictable explosion is the opposite of what we want from a fuel — controllability is essential for safety. Ideal fuels have high calorific value, moderate combustion rate, are cheap and readily available, easy to store/transport, and burn cleanly. No real fuel is perfectly ideal, but LPG and CNG come close.
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