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Mullite is an example of ______ refractory.

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Mullite is an example of ______ refractory.

(a) Acid

(b) Basic

(c) Neutral

(d) Special

The question was asked in an interview for job.

My question is from Properties of Refractories in portion Refractories & Dielectric Materials of Engineering Material & Metallurgy

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Right answer is (d) Special

The explanation: Special refractories are those materials having high purity and low porosity. Examples of special refractories are beryllia, zirconia, and mullite. These special refractories are comparatively expensive compared to the other types.

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