The metals present in brass are?

The correct answer is Option (1) → Cu & Zn

Brass is an alloy of copper and zinc. Transition metals form alloys readily because their atomic radii are similar, so atoms of one metal can take the place of the other in the crystal lattice. Bronze, the other common copper alloy, is copper with tin.

NCERT (2026-27 edition):
Alloy Formation – “An alloy is a blend of metals prepared by mixing the components. Alloys may be homogeneous solid solutions in which the atoms of one metal are distributed randomly among the atoms of the other. Such alloys are formed by atoms with metallic radii that are within about 15 percent of each other. Because of similar radii and other characteristics of transition metals, alloys are readily formed by these metals. … Alloys of transition metals with non transition metals such as brass (copper-zinc) and bronze (copper-tin), are also of considerable industrial importance.”