Fuels and Combustion
Insitu theory and drift theory are related to the

Origin of petroleum oil
Variation of coal quality with depth
Origin of coal
Coalification

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Fuels and Combustion
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

Because, it alone produces unreactive coke
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
Neither A nor B
Both A & B

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