solid state - important questions

1.Classify the following solids as crystalline and amorphous. 

    Sodium chloride, quartz glass, quartz, rubber, polyvinyl chloride, Teflon 

2.Categorize the give solids as metallic, molecular, ionic, amorphous or network (covalent). 

  (a) Tetra phosphorus decaoxide (P4O10)    

  (b) Ammonium phosphate (NH4)3PO4  

  (c)  SiC                                 

  d) I2                          

  e) P4

  f) Graphite              

 g) Brass                            

  h) Rb                        

  I) LiBr                                                     

 (j ) Si                       

 (k) Plastic 

3.why glass is considered as super cooled liquid? 

4.why the window glass of old buildings show milky appearance with time? 

5.why the glass panes fixed to window or doors of old building become slightly thicker at bottom? 

6.Sodium chloride is a crystalline solid. It shows the same value of refractive index along all the direction. True/False.  Give reason. 

7. Crystalline solid are anisotropic in nature. What does this statement means?

     [CBSE 2011] 

8. differentiate between a) Short range order and long range order   b)anisotropic 

and isotropic nature

9. Why are amorphous solids also called pseudo solids?