Which of the following impurities reduces the refractoriness of magnesite bricks ?
Correct answer: D. All A., B. & C.
- A. Al2O3
- B. CaO
- C. SiO2
- D. All A., B. & C.
Explanation
Al2O3, CaO, and SiO2 act as impurities in magnesite and lower its effective refractoriness by forming lower-melting compounds with MgO. Therefore, all three listed oxides have this undesirable effect.
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