Concept:An alloy is a homogeneous mixture of two or more metals or of a metal with other elements.
Brass is a well-known alloy whose main components are copper and zinc.
Explanation:Brass is formed by mixing copper (
Cu) and zinc (
Zn) in varying proportions.
The zinc content usually ranges from
5% to
45%, which affects the strength and ductility of the alloy.
For example, a common brass composition contains about
70% copper and
30% zinc.
Because the metals are melted and mixed uniformly, brass has a consistent composition throughout, making it homogeneous.
The other options are incorrect because strontium is not used in brass, and nickel is not a primary component of brass.
Thus, brass clearly contains only copper and zinc among the given choices.
Answer:Option A: Copper and Zinc.