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#### Solid State Model Question Paper 1

12th Standard EM

Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

(a)

4 and 2

(b)

6 and 6

(c)

8 and 4

(d)

4 and 8

2. The number of carbon atoms per unit cell of diamond is

(a)

8

(b)

6

(c)

1

(d)

4

3. A solid compound XY has NaCl structure. if the radius of the cation is 100pm , the radius of the anion will be

(a)

$\left( \cfrac { 100 }{ 0.414 } \right)$

(b)

$\left( \cfrac { 0.732 }{ 100 } \right)$

(c)

100X0.414

(d)

$\left( \cfrac { 0.414 }{ 100 } \right)$

4. An example of metal deficiency defect

(a)

NaCl

(b)

AgCl

(c)

CsCl

(d)

FeS

5. Which one of the following crystal has 8: 8 structure?

(a)

MgF2

(b)

CsCl

(c)

KCl

(d)

NaCl

6. 5 x 2 = 10
7. Differentiate crystalline solids and amorphous solids.

8. Explain briefly seven types of unit cell

9. Distinguish tetrahedral and octahedral voids.

10. Define void.

11. What is coordination number?

12. 5 x 3 = 15
13. Why ionic crystals are hard and brittle?

14. Experiment shows that Nickel oxide has the formula Ni0.96.O1.00 What fraction of Nickel exists as of Ni2+ and Ni3+ ions?

15. Silver crystallines in fcc lattice. If edge length of the cell is 4.07 x 10-8 em and density is 10.5 g cm-3. Calculate the atomic mass of silver

16. What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 2/3rd of tetrahedral voids?

17. Inspite of long range order in the arrangement of particles, why are the crystals usually not perfect?

18. 4 x 5 = 20
19. Sodium metal crystallizes in bcc structure with the edge length of the unit cell 4.3X108.cm. calculate the radius of sodium atom.

20. Write a note on Frenkel defect.

21. What are molecular solids? Explain the types of molecular solids.

22. How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.