Fuels and Combustion
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?

C + H₂O ⟷ CO + H₂
2CO ⟷ C + CO₂
C + 2H₂O ⟷ CO₂ + 2H₂
CO + H₂O ⟷ CO₂ + H₂

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Fuels and Combustion
Beehive coke oven

Takes 2-3 days for coking of coal but requires no external fuel for heating
Produces coke with very poor strength
Facilitates by-products recovery
Gives larger yield of coke (around 85%) as compared to by-product ovens

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