Question

Which of the following examples possess lustre?
A.silver
B.platinum
C.mercury
D.all of the above

Answer 1

Hint: We have to know that the lustre mainly depends upon the refractive power of the minerals, structure and degree of transparency. Hence, in mineralogy, the lustre is the aspect of the mineral surface with respect to its light reflective qualities. And the lustre is mainly classified into two types which is, metallic lustre and non- metallic lustre. The lustre interacts with the surface of rock, crystal, minerals etc.

Complete answer:
Here, silver acts as a lustre and it is a metallic lustre which is bright in nature. And it is white in colour when the silver is untarnished. But silver is not the only lustre in the given option. Hence, option (A) is incorrect.
The platinum acts as a metallic lustre. But in the given compounds not just platinum possess the lustre. Hence, the option (B) is incorrect.
Mercury is an example of lustre. But not only has mercury possessed the lustre. Hence, option (C) is incorrect.
Among the given examples, all the elements possess the lustre. The silver is metallic lustre which is bright in nature. And it is white in colour when the silver is untarnished.
And free electrons are present in all the metals. The photons present in the light do not penetrate too much to the metal surface and by moving electrons, the metallic surface will be reflected and there is a formation of metallic reflection. Thus, it acts as lustre. Hence, the option (D) is correct.

Note:
Among the given examples, silver, platinum, and mercury act as lustre. In this case, all the elements have a light- reflecting quality. And this property mainly depends on the refractive power, structure and its transparency. And the lustre is mainly classified into two which are metallic and non- metallic. In the case of metallic lustre, it will be very shiny due to its reflecting nature.