SSC MTS EXAM

Detailed explanation-1: -Crystalline solids have a high fixed value for the heat of fusion and a definite melting point. However, non-crystalline solids do not have a fixed value for the heat of fusion and they melt over a range.

Detailed explanation-2: -Crystalline materials have their atoms arranged in a periodic, ordered 3D array. Typically, all of the metals, many ceramics, and some polymers are crystalline. Noncrystalline materials have atoms with no periodic arrangement, i.e., a random order.

Detailed explanation-3: -Amorphous solids do not have a definite heat of fusion.

Detailed explanation-4: -amorphous solid, any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.