The GATE Grind

GATE 2025 MT – Question 20

Mineral Processing and Extractive Metallurgy · Primary and secondary steelmaking · 1 mark · Multiple choice

Which one of the following slag components is responsible for the oxidizing power of steelmaking slags?

  1. $\mathrm{SiO}_2$
  2. $\mathrm{CaO}$
  3. $\mathrm{MgO}$
  4. $\mathrm{FeO}$

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Correct answer: (D) $\mathrm{FeO}$

Explanation

FeO acts as an oxygen source and participates in oxidation of dissolved elements in the metal. CaO and MgO primarily contribute basicity/refractory compatibility, while SiO2 is an acidic oxide. Thus the listed component responsible for oxidizing power is **FeO, D**.