Alumina is insoluble in water because:

It is a covalent compound

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It has high lattice energy and high heat of hydration

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It has lattice energy and high heat of hydration

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A l^{3 +}

and

O^{2 -}

ions are not excessively hydrated

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Solution

The correct option is B It is a covalent compound
Al2O3 has high lattice energy and low heat of hydration and covalent bond. It is therefore, insoluble in water.

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