Magnesium may be called a refractory because it?

has high melting point

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is a good conductor of heat

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is chemically inert as well as an electrical insulator

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forms Grignard's reagent

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Solution

The correct option is A has high melting point
A refractory material or refractory is a heat-resistant material
Magnesium oxide is used to make linings for some furnaces. It is known as a refractory material - which just means that it is resistant to heat. You may have come across this on the CIE page about ceramics. Magnesium oxide has a high melting point (2852°C) and so resists the high temperatures in a furnace.

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