Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?
Correct answer: D. Crucibles used for melting of high purity metals
- A. Segar cones
- B. Muffles for muffle furnaces
- C. Insulating bricks
- D. Crucibles used for melting of high purity metals
Explanation
Thoria is costly and radioactive, but its very high melting point and chemical stability allow it to be used in crucibles for melting high-purity metals. These properties reduce contamination of the melt.
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