MgO can be used as refractory material because :
(a) it is a good electrical insulator
(b) it has high melting point
(c) it is a good conductor of heat
(d) all of these

Answer: Option 4
Explanation:
MgO (Magnesium Oxide) can be used as a refractory material for several reasons:

(a) It is a good electrical insulator: Refractory materials are used in high-temperature applications, and they should be able to withstand extreme heat without conducting electricity. MgO possesses this property, making it suitable for refractory applications where electrical insulation is required.

(b) It has a high melting point: Refractory materials need to have a high melting point to withstand the intense heat they are exposed to without melting or deforming. MgO has a very high melting point, making it ideal for use in high-temperature environments.

(c) It is a good conductor of heat: While this statement is contrary to the typical behavior of refractory materials, MgO is actually a poor heat conductor. This property is advantageous for refractory applications because it helps prevent the rapid transfer of heat, allowing the material to act as a heat insulator.

Due to these three properties—being a good electrical insulator, having a high melting point, and being a poor conductor of heat—MgO is an excellent choice for refractory applications in various industries, such as metallurgy, ceramics, glassmaking, and high-temperature processing of materials.

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