Class XII :CHEMISTRY : CHAPTER-I :SOLID STATE : NUMERICAL TEST

CHEMISTRY-CHAPTER-I (SOLID STATE)

NUMERICAL TEST

1)    Silver crystallizes in FCC structure. The edge length of unit cell is found to  be 408.7 pm. Calculate density of silver (Ag= 108g mol^-1)                            2M

2)    Naturally occurring gold crystallizes in FCC structure and has density of 19.3gcm^-3. Find atomic radius of gold (Au=197g mol^-1)                                       2M

3)    Copper crystallizes in FCC type unit cell. The edge length of unit cell is 360.8pm. The density of metallic copper is 8.92gcm-3. Determine atomic mass of copper.                                       2M

4)    Unit cell of crystalline sodium hydrogen diacetate (molecular mass= 142) has density of 1.4g mL-1. Its unit cell contains 24 molecules. Calculate the edge length of the unit cell.             2M

5)    Predict the coordination number of Cs⁺ ion and structure of

 CsCl if r_Cs+=1.69A⁰ and r_Cl-=1.81A⁰.                                      2M

6)    Predict coordination number of Na⁺ ion and structure of NaCl crystal if r_Na+= 0.95A⁰ and r_Cl-= 1.81A⁰.                                       2M

7)    Unit cell of iron crystal has edge length of 288pm and density of

 7.86gcm-3. Determine the type of crystal lattice (Fe=56).            3M