A crystalline solid

a. Changes abruptly form solid to liquid when heated

b. Has no definite melting point

c. Undergoes deformation of its geometry easily

d. Has an irregular 3- dimensional arrangements

e. Softens slowly

Ans. a

Explanation : In crystalline solid there is perfect arrangement of the constituent particles only at 0  K. As the temperature increases the chance that a lattice site may be unoccupied by an ion increases. As the number of defects increases with temperature solid change in liquid