Assertion: Quartz glass is crystalline solid and quartz is an amorphous solid.
Reason: Quartz glass has long range order.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true, but reason is not the correct explanation of assertion.
C. If assertion is true, but reason is false.
D. If both assertion and reason are false

Answer

D

Explanation

Quartz glass is an amorphous solid because it is formed by fusing the crystal which is then cooled rapidly. Whereas, quartz, like all other minerals, is a crystalline solid with the molecular formula `SiO_2` . Quartz glass has no long range order because the components in its structure are not arranged in regular arrays whereas crystalline solids have regular long range order because the components in its structure are held together by uniform inter-molecular forces and they have a certain pattern of atoms that is repeated over and over in three dimension. Thus, both assertion and reason are false.