CHEMISTRY · Subjective · CBSE · Chemistry · Is Matter Around Us Pure? · Is Matter Around Us Pure?
Problem
A student claims that 14-karat gold, an alloy consisting primarily of Au atoms with Cu atoms evenly dispersed throughout, is a pure substance because it is visually uniform. Identify the flaw in the student’s reasoning and explain, in two sentences or fewer, why 14-karat gold should be classified as a mixture.