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Calorific value and ignition temperature...

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.

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The correct Answer is:
Fuel Y is a better fuel ; (i) Moderate ignition temperature of `75^(@)C` (ii) Produces no harmful gas (like CO) n burning.
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