A good characteristics of fuel is that it:

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Leaves more ash

Leaves no ash

Is highly expensive

None of the above

answer is B.

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Detailed Solution

Concept- A fuel is any substance that provides heat energy on its combustion.
An ideal fuel is the one that satisfies certain criteria.
●       An ideal fuel must be easily available.
●       It must be cheap.
●       It must burn easily in air at a moderate rate.
●       It must release a high amount of energy.
●       It should not leave unwanted substances.
●       Must be environment-friendly
●       Should be reproducible.
From the given options, only option 2 matches with the conditions of a good fuel as ash produced is an unwanted substance. A fuel which does not leave any ash is considered to be a good fuel.
Hence, the correct option is (2).

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