The highest melting pure oxide (m.p. > 3000°C)is___________________?
Correct answer: A. Thoria
- A. Thoria
- B. Alumina
- C. Beryllia
- D. Zirconia
Explanation
Thoria (ThO₂) has an exceptionally high melting point of about 3300°C, higher than alumina, beryllia, and zirconia. This makes it one of the most refractory pure oxides.
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