Fuels and Combustion
Calorific value of

N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is lower than that of equivalent olefins
Light paraffinic fuel oils is equal to that of equivalent olefins
Light paraffinic fuel oils is higher than that of equivalent olefins

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Fuels and Combustion
Froth floatation is used for

Washing lump coal (> 80 mm size)
All of these
Removing ash from the coal based on difference in specific gravity of coal and ash
Washing fine coal dust (< 0.5 mm size)

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