Question

9. Which of the following statements is not true
a) Materials are grouped for convenience
b) Materials are grouped to study their properties.
(c) Materials are grouped for fun
(d) Materials are grouped according to their uses.​

Answer 1

Answer:

b,c, are not true and all are true

Answer 2

Answer:

Materials are grouped to study their properties.

Explanation:

according to their properties their uses changes and so these properties vary and hence they are grouped...