In case of good fuels, ignition temperature is X and calorific value is Y. X and Y respectively are

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high and low

high and high

low and high

low and low

answer is A.

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Detailed Solution

The features of good fuel or ideal fuel are
(i) Readily available
(ii) Low cost
(iii) It should possess low ignition temperature
(iv) It should have high calorific value
(v) No residue left over after burning i.e. least pollutant.

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