0Solid State (25 Marks):
1. Name one solid which show both Frenkel defect & Schottky defect.
2. In a close packing of N spheres how many (i) tetrahedral (ii) octahedral sites are present?
3. Describe energy gap in conductors & semiconductors band theory.
4. What type of defect is produced when NaCl is doped with MgCl2?
5. Define ‘F’ Center.
6. What is the two dimensional coordination number of a molecule in square close packed layer & hexagonal close packing?
7. Describe metal excess deficiency.
8. Describe the p-type semiconductors.
9. Ionic solids, which have anionic vacancies due to metal excess defect, develop. Explain with the help of a suitable example?.
10. ZnO is white but it turns yellow on heating, explain.
11. An element with molar mass 7 × 10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7 × 103 kg m−3, what is the nature of the cubic unit cell?
12. Explain the following with suitable examples:
i. Ferromagnetism.
ii. Paramagnetism.
iii. Ferrimagnetism.
iv. Antiferromagnetism.
iv. 12-16 and 13-15 group compounds. 5
