Fuels and Combustion
A coal having high volatile matter content will

Burn with a small non-smoky flame
Have a very high calorific value
Give less yield of tar and gas on carbonisation
None of these

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

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

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