Concept:Brass is an alloy in which atoms of one metal replace the atoms of another metal in the crystal lattice.
Explanation:Brass is formed by mixing copper and zinc.
In its crystal lattice, some
Cu atoms are replaced by
Zn atoms.
This replacement happens without changing the overall crystal structure.
When an atom of the host lattice is replaced by a different atom of similar size, it creates a substitutional impurity defect.
Here,
Zn atoms substitute
Cu atoms, so brass shows a substitutional impurity defect.
It is not an interstitial defect because no extra atoms are placed in the gaps.
It is not a Schottky defect because no vacancies are formed by missing ion pairs.
It is not a metal deficiency defect because the metal-to-metal ratio remains balanced.
Answer:Option C – Substitutional impurity defect.