A basic refractory material among the following is :

A l_{2} O_{3}

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S i O_{2}

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F e_{2} O_{3}

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C a O

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Solution

The correct options are
A $A l_{2} O_{3}$
B $S i O_{2}$
D $C a O$
Basic refractories include magnesia, CaO, dolomite, chrome, and combinations of these materials.

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