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What is the fusion temperature of Magnesia?

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What is the fusion temperature of Magnesia?

(a) 1700^oC

(b) 2180^oC

(c) 2800^oC

(d) 3500^oC

The question was asked during an online interview.

I'd like to ask this question from Properties of Refractories topic in division Refractories & Dielectric Materials of Engineering Material & Metallurgy

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Correct option is (c) 2800^oC

Best explanation: Magnesia is a type of basic refractory material which has an approximate fusion temperature of 2800^oC. The fusion temperature for silica is 1700^oC while that for chromite is 2180^oC. Basic refractories find applications in open hearth furnaces.

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