Question

The sharp melting point of crystalline solid is due to .............

(a) a regular arrangement of constituent particles observed over a short distance in the crystal lattice

(b) a regular arrangement of constituent particles observed over a long distance in the crystal lattice

(c) same arrangement of constitent particles in different directions

(d) different arrangement of constituent particles in different directions

Answer 1

(b). A solid is said to be crystalline if the various constituent structural units (atoms, ions or molecules) of which the solid is made, are arranged in a definite geometrical pattern within the solid. The type of forces in crystalline solids are of long-range order due to which they have a sharp melting point.