(C) Alumina $(Al_2O_3)$ is a very stable oxide of aluminum. It has a very high melting point due to the strong ionic bonds between aluminum and oxygen

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(C) Alumina $(Al_2O_3)$ is a very stable oxide of aluminum. It has a very high melting point due to the strong ionic bonds between aluminum and oxygen atoms in its crystal lattice. The melting point of pure alumina is approximately $2348\;K$ $(2075\;^{\circ}C)$. Therefore,option $C$ is the correct answer.