Question

Which of the following statement is incorrect about the crystalline and amorphous solids?

• A. Crystalline solids have ordered structure but amorphous solids do not.
• B. Crystalline solids have a sharp melting point but amorphous solids do not.
• C. Crystalline solids give irregular cleavage whereas amorphous solids can be cleaved along definite planes.
• D. Crystalline solids have a characteristic heat of fusion but amorphous solids do not.

Answer 1

The correct option is C

Crystalline solids give irregular cleavage whereas amorphous solids can be cleaved along definite planes.

In crystalline solids, the particles (atoms, ions, or molecules) are orderly arranged and thus have characteristic geometry while amorphous solids do not have characteristic geometry. A crystalline solid has a sharp melting point, i.e., it changes into a liquid state at a fixed temperature, whereas an amorphous solid does not have a sharp melting point.