Fuels and Combustion
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

Carbonisation
None of these
Hydrogenation
Gasification

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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