[amp_mcq option1=”its high density” option2=”its high polishing” option3=”its chemical inertness” option4=”presence of free electrons” correct=”option4″]
The correct answer is D. presence of free electrons.
The luster of a metal is due to the presence of free electrons. These electrons are able to move freely within the metal, and they reflect light in a way that produces a shiny appearance.
Option A is incorrect because the density of a metal does not affect its luster.
Option B is incorrect because the polishing of a metal does not affect its luster.
Option C is incorrect because the chemical inertness of a metal does not affect its luster.