Explain why (1) Magnesium oxide is (a) soluble in water but not in alcohol. (b) conducts electricity in molten but not in solid state. (2) Aluminium cannot be obtained from its oxide (alumina) by reducing with carbon.
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Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + H2O → Mg(OH)2), but it can be reversed by heating it to separate moisture.
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