which of the following statement is not true about amorphous solids ?
(a) On heating they may become crystalline at certain temperature
(b) They may become crystalline on keeping for long time
(c) Amorphous solids can be moulded by heating
(d) They are anisotropic in nature
The phenomenon by which an element exists in two or more different crystalline or amorphous forms is called ___.
Differentiate between:
(a) The crystalline and non-crystalline or amorphous forms of carbon.
(b) Diamond and graphite.