A) \[Si{{O}_{2}}\]
B) \[CaO\]
C) graphite
D) \[MgO\]
Correct Answer: C
Solution :
Refractory materials are the substances which resists high temperature and do not become soft.\[Si{{O}_{2}}\]and ganister are acidic refractories,\[CaO\]and\[MgO\]are basic refractories and graphite, chromite and carborundum are neutral refractories.
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