Solid State Book Back Questions

12th Standard EM

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
5 x 1 = 5
1. Graphite and diamond are

(a)

Covalent and molecular crystals

(b)

ionic and covalent crystals

(c)

both covalent crystals

(d)

both molecular crystals

2. 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

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

(a)

8

(b)

6

(c)

1

(d)

4

4. The composition of a sample of wurtzite is FeO0.931.00 what % of Iron present in the form of Fe3+?

(a)

16.05%

(b)

15.05%

(c)

18.05%

(d)

17.05%

5. 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)

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

6. 3 x 2 = 6
7. classify the following solids
a. P4
b. Brass
c. diamond
d. NaCl
e. Iodine

8. Explain briefly seven types of unit cell

9. Distinguish tetrahedral and octahedral voids.

10. 3 x 3 = 9
11. Explain Schottky defect.

12. Explain AAAA and ABABA and ABCABC type of three dimensional packing with the help of neat diagram.

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

14. 2 x 5 = 10
15. Atoms X and Y form bcc crystalline structure. Atom X is present at the corners of the cube and Y is at the centre of the cube. What is the formula of the compound?

16. Write a note on Frenkel defect.