Which of these is an example of recombination of atoms to form newer molecules?

Molding a wire of gold

Hammering a piece of iron

Tarnishing of a silver coin

Rolling of a sheet of aluminum

The correct option is C.

The recombination of atoms to form newer molecules is called chemical change. Tarnishing is a chemical change that occur when a metal lose luster as a result of exposure to moisture and water which results in a thing layer of corrosion which forms over the metal.