Highest melting (m.p = 3070°C) oxide refractory is__________________?
Correct answer: B. Thoria
- A. Alumina
- B. Thoria
- C. Zirconia
- D. Magnesia
Explanation
Thoria has an exceptionally high melting point of about 3070°C, higher than alumina, zirconia, and magnesia. It is therefore regarded as the highest-melting oxide refractory in this list.
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