Question

What do you understand by lustrous objects?
Give two examples of nonlustrous objects.
Which materials are said to be soft?
Which materials are said to be hard?
What do you understand by solubility?​

Answer 1

Answer:

Lustrous means smooth, very shiny or having lustre.

Sodium and Potassium

Soft: Materials which can be compressed easily are called soft, e.g. chalk, cotton, rubber, etc.

Hard: Material which are difficult to compress are called hard, e.g. diamond, stone, wood, steel, etc. Diamond is the hardest natural substance. Soft: Materials which can be compressed easily are called soft, e.g. chalk, cotton, rubber, etc.

Answer 2

Answer:

the objects which shine are called lustrous objects