\(ZnS\), \(AgCl\), \(AgBr\) and \(AgI\) show which of the following defect

Frenkel Defect

The correct answer is option 1. Frenkel Defect.

Out of the given options, all the materials - \(ZnS\), \(AgCl\), \(AgBr\) and \(AgI\) - exhibit Frenkel Defect.

Frenkel defect occurs when an ion (usually a cation due to smaller size) moves from its regular lattice site to an interstitial position within the crystal, creating a vacancy at the original site.

\(ZnS\), \(AgCl\), \(AgBr\) and \(AgI\) are ionic solids where the cation (\(Zn^{2+}\) or \(Ag^+\)) is smaller than the anion (\(S^{2-}\) or \(Cl^-\), \(Br^-\), \(I^-\)). This size difference makes Frenkel defects favorable in these materials.

Schottky defect involves the absence of both a cation and an anion from their regular lattice sites, maintaining electrical neutrality. This is less likely in these compounds compared to Frenkel defects.

Impurity defect involves the presence of a foreign atom within the crystal lattice. While possible, it's not the dominant defect type.

Metal excess defect is specific to situations where there are extra metal atoms compared to the stoichiometric ratio. It's not applicable here.