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MgO is used as a refractory material- Ex...

MgO is used as a refractory material- Explain why?

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Due to greater charge on both the cation `(Mg^(2+))` and the anion `(O^(2-))`, MgO possesses higher lattice energy and for this, it has very high melting point and does not decompose on heaung. For this reason, it is used as a refractory material.
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