Question

Give reason heating a platinum wire is a reversible change but heating a magnesium wire is in reversible change

Answer 1

as platinum is a less reactive metal so heating a wire of platinum is a reversible change but heating a Mg ribbon in air it burns vigorously and forms a new compound MgO

Answer 2

Answer:

A platinum wire is a reversible change because it can be reversed but heating a magnesium wire is an irreversible change because it cannot be reversed.