Brass as a Metallic Mixture

Steps:

• Recall that brass is made by mixing metals like copper and zinc.
• Identify brass as a homogeneous mixture, not a pure substance.
• Compare to chemical definitions: compounds form via reactions, isomers share formulas, isotopes vary in neutrons.
• Match brass to the alloy category, a metal blend without chemical bonding.

Why B is correct:

• An alloy is a homogeneous mixture of two or more metals, and brass fits this as a copper-zinc mixture without forming a new compound.

Why the others are wrong:

• A: Compounds have fixed ratios from chemical reactions; brass is a physical mixture.
• C: Isomers are molecules with the same formula but different structures; brass is not molecular.
• D: Isotopes are atomic variants of the same element; brass involves different elements.

Final answer: B