An iron blast furnace produces hot metal containing 95% Fe. The iron ore charged into the furnace contains 95% Fe₂O₃ and the rest is gangue. Assume that all the iron in the ore goes to hot metal. The amount of iron ore (in kg) required for producing 1000 kg of hot metal is (Atomic weight of Fe = 56 g mol^-1 and that of Fe₂O₃ = 160 g mol^-1)

purpose of flux in blast furnace

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

High top pressure in the blast furnace

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

Dephosphorisation of molten pig iron is favoured by

A. oxidising and basic slag

B. reducing and basic slag

C. high activity co-efficient of phosphorous in metal

D. oxidising and neutral slag

High top pressure in a blast furnace operation

A. favours the solution loss reaction

B. suppresses the solution loss reaction

C. decreases gas-solid contact time

D. increases coke rate