Which of the following statements are true for crystalline solids

          1) Crystalline solids have sharp melting points

 

          2) Crystalline  solids have  uniform chemical composition

 

          3) Crystalline solids are anisotropic

 

          4) Their  physical properties depend upon direction

1. Crystalline solids have sharp melting points  i.e., on heating  all the bonds get ruptured  suddenly at a  fixed temperature

2. Crystalline solids have uniform chemical composition  i.e.,  bonds between all the  atoms and molecules  are of equal strength

3. Crystalline solids are anisotropic  i.e. physical properties depend on direction. It means they have different values  in different direction.