(i) Definite and characteristic heat of fusion
(ii) Isotropic nature
(iii) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal
(iv) A true solid
Correct Answer: (ii) Isotropic nature
Explanation: Crystalline solids are naturally anisotropic, which is one of their physical properties such as electrical resistance or refractive index showing different values when measured with different indicators in the same crystal. This arises from different particle arrangement.