Fuels and Combustion
With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion

Increases
Decreases
Remains same
Either A or B, depends on other factors

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Fuels and Combustion
Fixed carbon in coal is defined as

That present in volatile matters
Hundred minus the percentage of volatile matter, ash and moisture
The total quantity of carbon present in the coal
The one which is present in the residue after combustion

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