(a) Which of the following is not a characteristic of a crystalline so

(a) Which of the following is not a characteristic of a crystalline solid?(i) Definite heat of fusion(ii) Isotropic nature(iii) A regular ordered arrangement of constituent particles(iv) A true solid(b) Frenkel defect and Shottky defects are two stoichiometric defects found in crystalline solids.(i) What are stoichiometric defects?(ii) Write any two differences between Frenkel defect and Schottky defect.

Answer»

(a) (ii) Isotropic nature
b) (i) Stoichiometric defects are those point defects which do not disturb the stoichiometry of the solid.

(ii)

Schottky defect	Frenkel defect
1. Cation and anion in are of almost similar sizes	There is a large difference size of ions
2.The density of the crystal is lowered	It does not affect the density of the crystal