Question

5. Which of the following is possible close packing scheme?
(2) ABCABC..... (b) ABCCAB
(C) ABCABC ....... (d) ACBABC ...
6. Which of the following is possible hcp scheme ?
(a) ABAC....... (b) BAAB (C) ABBA ...... (d) ABAB ......
7. Schottky defect is due to
(a) dis-location of the lattice
(b) vacancies in the lattice
(c) movement of anions in the lattice
(d) movement of cations in the lattice.
8. What are the co-ordination numbers of Na* and CI ions in NaC1?
(a) 6 each (b) 12 each (c) for Na 6 and CI3 (d) 4 each
9. Consider the structure of CsCl. What is the proportion of coordination number of cation
and anion?
(a) 8:8
(6) 6:6
(c) 1:2
(d) 1:3
10. How many Csions and how many Clions are present in the CsCl unit cell ?
(a) one of each
(b) one Cs and two CI-
(C) two Cs* and one C1"
(c) half of Cst and one Cr
11. Sodium chloride has structure.
(a) fcc
(b) hcp
(c) bcc
(d) fluorite
12. Caesium chloride has a structure.
21​

Answer 1

Answer:

Schottky defectis due to

Answer 2

Explanation:

a,c,b,d,a,a,b,b,c,c,c,c,