Q.

Slag is a name given for -

A. molten iron
B. molten sand
C. molten alumina
D. molten calcium silicate
Answer» C. molten alumina
Explanation: Slag is a partially vitreous by- product of the process of smelting ore, which separates the desired metal fraction from the unwanted fraction. A good example is steelmaking slag: quicklime and magnesite are introduced for refractory protection, neutralizing the alumina and silica separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.
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