Which property is most commonly observed in ionic compounds like sodium chloride?
High melting and boiling points
Ionic compounds such as sodium chloride are held together by strong electrostatic forces between oppositely charged ions arranged in a giant three-dimensional lattice. A very large amount of energy is needed to break these attractions, so ionic compounds have high melting points and high boiling points.
In the solid state the ions are locked in the lattice and cannot move, so ionic solids do not conduct electricity well. They conduct only when melted or dissolved in water, because the ions then become free to move. So options A and C are incorrect. Low melting and boiling points are typical of covalent molecular compounds, not ionic ones, so D is also wrong.
Hence, the answer is High melting and boiling points.
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