#### Solid State Three Marks Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 30
10 x 3 = 30
1. Explain Schottky defect.

2. Write short note on metal excess and metal deficiency defect with an example

3. Calculate the number of atoms in a fcc unit cell

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

5. Why ionic crystals are hard and brittle?

6. Calculate the percentage efficiency of packing in case of body centered cubic crystal.

7. What is the two dimensional coordination number of a molecule in square close packed layer?

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

9. How do the spacings of the three planes (100), (101) and (111) of simple cubic lattice vary?

10. A metallic element exists as a cubic lattice. Each edge of the unit cell is 2.88$\mathring { A }$. The density of the metal is 7.20 g cm-3. How many unit cells there will be in 100g of the metal?