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What are the properties that make oxides...

What are the properties that make oxides of MgO and BeO useful for lining furnaces?

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The given properties make MgO and BeO useful for lining furnaces- (1) They have high melting points [melting point of Beo is `2500^@C` (approx) and MgO is `2800^@C` (approx)]. (2) They are very good conductors of heat. (3) They have very low vapour pressure. (4) They are chemically inert. (5) They are insulators.
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