Which one among the following oxides has the highest melting point?

Options

A $\mathrm{Na}_2 \mathrm{O}$
BMgO
C $\mathrm{Fe}_2 \mathrm{O}_3$
DCuO

Correct answer

B. MgO

Step-by-step solution

Among the options given, the oxide with the highest melting point is MgO (Magnesium oxide). Magnesium oxide has a very high melting point of about 2,852^{{}^{\circ}} \mathrm{C} \left(5,166^{{}^{\circ}} \mathrm{F}\right). This high melting point is due to the strong ionic bonds between magnesium and oxygen atoms in the crystal lattice structure of MgO.

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