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Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?

/ Fuels and Combustion / By
Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?

A. 1000
B. 4000
C. 6000
D. 8000