During the production of iron and steel.

Options

A. The oxide ore is primarily reduced to iron by solid coke according to the reaction
`2Fe_(2)O+3C to 4Fe+3CO_(2)`
B. The oxide ore is reduced by the carbon monoxide according to the reaction
`Fe_(2)O_(3)+3CO to 2Fe+3CO_(2)`
C. Major silica impurities are removed as calcium silicate slag by addition of a fluxing agent limestone
D. The silicate slag is used in manufacturing cement

Answer

B, C, D

Explanation

The oxide ore `(Fe_(2)O_(3))` is primarily reduced to iron by carbon monoxide
`SiO_(2)+CaO to CaSiO_(3)("Slag")`