12. A crystalline solid [Kerala CET (Med.) 2003] (a) Changes abruptly from 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
(a) Changes abruptly from solid to liquid when heated This option is correct as Crystalline solids are formed form solutions in liquids state to solid on specific pressure and temperature. And on heating their fixed structure melts abruptly to become liquid.
