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During the production of iron and steel:

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The oxide ore is primarily reduced to iron by solid coke according to the reaction. $2 {Fe}_{2} O_{3} + 3 C ⟶ 4 Fe + 3 {CO}_{2}$

The oxide ore is reduced by the carbon monoxide according to the reaction.

${Fe}_{2} O_{3} + 3 CO ⟶ 2 Fe + 3 {CO}_{2}$

Major silica impurities are removed as calcium silicate slag by addition of a fluxing agent lime stone.

The converter slag containing phosphorus is used as a fertilizer.

answer is B, C, D.

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Detailed Solution

According to the process shown in (A) and (B), carbon monoxide reduces the oxide ore:

${Fe}_{2} O_{3} + 3 CO \to 2 Fe + 3 {CO}_{2}$

Option A is wrong, and option B is correct as a result.

(C) By adding a fluxing agent, limestone $CaO + {SiO}_{2} \to {CaSiO}_{3}$ , significant silica impurities are eliminated as calcium silicate slag.

So, choice C is the right one.

(D) The silicate slag is employed in the production of cement.

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