(a) Give two general properties of ionic compounds and two those of covalent compounds.
(b) State one test by which sodium chloride can be distinguished from sugar.
(a)(i) Ionic compounds are soluble in water.
They have high melting and boiling points.
(ii) Covalent compounds are insoluble in water.
They have low melting and boiling point.
(b) Sodium chloride and sugar can be distinguished by the electrical conductivity test.
Sugar does not conduct electricity when dissolved in water as it is a covalent compound but sodium chloride conducts electricity when dissolved in water as it is an ionic compound.
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