The coke in the charge of blast furnace

A. Controls the grade of pig iron

B. Acts as an iron bearing mineral

C. Supplies heat to reduce ore and melt the iron

D. Forms a slag by combining with impurities

Answer: Option C

Solution(By Examveda Team)

The coke in the charge of blast furnace Supplies heat to reduce ore and melt the iron.
The coke is a source of carbon monoxide which will reduce the iron oxide in the ore to iron and the carbon monoxide oxidizes to carbon dioxide.
The limestone acts as a flux to remove other impurities and help the iron physically separate from the rest of the burden.