Identify the type of defect in brass alloy.

Step-by-step solution

Brass alloy contains zinc atoms substituting copper atoms in the lattice structure. This creates a substitutional impurity defect, defined by impurity atoms occupying regular lattice sites. Interstitial defects involve smaller atoms fitting between lattice positions, while Schottky defects require ionic crystals with cation/anion vacancies. Metal deficiency defects occur in non-stoichiometric compounds with variable oxidation states. Zinc's atomic radius ( 134 , pm vs copper's 128 , pm ) allows direct substitution