Question

(ii) Which one will show a metallic lustre?
(a) Any surface of a metal
(b) Freshly cut surface of a metal
(c) Freshly cut surface of non-metal
(d) Surfaces of all materials

Answer 1

Answer:

b is the right answer.

Hope this helps. :-)

Answer 2

Metallic luster is shown by a freshly cut surface of a metal. [option (b)].

What is metallic luster?

• The property of metals by which they have a shiny surface is called metallic luster.
• Minerals with a metallic luster are usually opaque and can reflect light easily.
• The luster is the amount of light that is reflected by the valence(outermost) electrons of a metal.

Why does the freshly cut surface of a metal show luster?

• The freshly cut surface of metal shows luster because of the free electrons present on its surface.
• These free electrons can easily reflect light and impart a shiny texture to the metal.
• Hence, it shows the metallic luster.

Therefore, option (b) Freshly cut surface of a metal is correct.