For efficient performance of a blast furnace, the extent of reduction of lustite should be

A. bring down the softening point of the gangue materials B. reduce the viscosity of the slag C. to maintain proper basicity D. all of these

A. decreases the time of contact between gas and solid B. increases the time of contact between gas and solid C. increases fuel consumption D. increases the rate of solution loss reaction

A. oxidising and basic slag B. reducing and basic slag C. high activity co-efficient of phosphorous in metal D. oxidising and neutral slag

A. favours the solution loss reaction B. suppresses the solution loss reaction C. decreases gas-solid contact time D. increases coke rate