Fuels and Combustion
Fossil fuels mean

Premature fuels with low calorific value
Those fuels which are found in the crust of earth
Liquid fuels
Solid fuels

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Fuels and Combustion
Froth floatation is used for

All of these
Washing lump coal (> 80 mm size)
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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