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Alumina is insoluble in water because: a. It is a covalent compound b. It has high lattice energy and low heat of hydration c. It has low lattice energy and high heat of hydration d.
Al
3
+
\text{Al}^{3+}
Al
3
+
and
O
2
−
\text{O}^{2-}
O
2
−
ions are not excessively hydrated
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