Chemistry : Part I for Class XII
The Solid State - 01

Instructions 

1. All questions are compulsary.
2. Please give the explanation for the answer where applicable.
3. To view the answer, click on the Answer link alongside the Question.
You can view the answer when the link becomesGreen Red. on completion of allocated time.

Q.1) Define 
(i) Schottky defect 
(ii) Frankel defect
(iii) Point defects 
(iv) Interstitials
(v) Vacancy (5 Marks) 

Q.2) What are-
(i) Molecular solids 
(ii) Metallic solids (2 Marks) 

Q.3) What are voids? How a tetrahedral void differ from octahedral void? (3 Marks) 

Q.4) Classify the following solids as metallic; molecular,amorphous, covalent or ionic.
(i) SO2 
(ii) Diamond 
(iii) I2 
(iv) MgO
(iv) Ag 
(v) Quartz 
(vi) Ar (3 Marks) 

Q.5) Define:
(i) Crystal lattice
(ii) Co-ordination number (2 Marks) 

Q.6) Define body centred and face centred cubic system. (2 Marks) 

Q.7) What do you understand by stiochiometric defects in ionic crystal? (1 Marks) 

Q.8) Write two examples of amorphous solids? (1 Marks) 

Q.9) A solid substance XY has a rock salt geometry. What is the co-ordination number of X and Y? How many atoms of X and Y are present in the unit cell? (1 Marks)