Question

which of the following is lustrous​

Answer 1

Copper [Cu] is chosen as lustrous material as it is a metal and it is the physical property of a metal. On polishing, it gets a natural lustre.

Wood, plastic and chalk aren't chosen because they don't have their lustre of themselves as they are non metallic objects. And non metals don't have lustre in their physical property [except diamond which is a form of carbon].

Thanks...

Answer 2

hey there,

here is your ans

Answer. Copper [Cu] is chosen as lustrous material as it is a metal and it is the physical property of a metal. On polishing, it gets a natural lustre. Wood, plastic and chalk aren't chosen because they don't have their lustre of themselves as they are non metallic objects.