JEE Main levelSingle correct optionDifficulty 2 of 3ss026
Which statement about quartz and quartz glass is correct?
AQuartz is crystalline with a sharp melting point; quartz glass is amorphous and softens over a range of temperature
BBoth are crystalline but differ in colour
CQuartz is amorphous and glass is crystalline
DBoth have long-range order and the same melting behaviour
Answer: A
Quartz has a regular long-range three-dimensional arrangement of SiOX4 units and melts sharply. Quartz glass (fused silica) has only short-range order, so it behaves as a supercooled liquid and softens gradually.