1. 
The above defect is
Ans: Stoichiometric Frankel defect
2. For the crystal FexO the value of 'x' is likely to be-
Ans: 0.95
3. A: The conductivity of 'ZnO' crystal increases at high temperature
R: Electrons are trapped by both Zn+2 and
O-2 ions at higher temperatures in the crystal.
Ans: A is true, R is false
4. Which of the following statements are correct
I. Volume occupied by spheres in FCC arrangement is 74%
II. The metal that crystallises in hcp structure has coordination no 8
III. A unit cell of ionic crystal shares some of its ions with other unit cells
IV. The edge length of unit cell in NaCl is 552 pm.
(rNa+ = 95 pm, rCl-= 18/pm)
Ans: I, III, IV
5. Three metals A, B, C crystallises in simple cubic, BCC, FCC lattices resp. The no of unit cells in one mole of each of the metals resp. will be
Ans: N, N/2, N/4
6. Simple cubic arrangement is observed in
Ans: Po
7. For a Crystal, the angle of diffraction (2θ) is 180° and the second order diffraction has a d value of 0.228 nm. The wavelength of x - rays used in Bragg's experiment is
Ans: 2.28 A°
8. The conductivity range of metals is-
Ans: 104 - 108 ohm-1cm-1
9. Important initiator used for cationic, polymerization is
Ans: Lewis acid in the presence of small amount of water
10. Ozonolysis product of natural rubber is
Ans: 4-oxopentanal
11. Incorrect statement about the Polymer Buna-S is
Ans: It is used in making oil seals
12. In a polymer sample 30% of molecules have a molecular mass of 'X'. 40% of molecules have 30,000 and rest have 60,000. If the number average molecular weight of the polymer is 36,000. 'X' value is
Ans: 20,000
13. Monomers of biodegradable polymer aminoacids-
Ans: Nylon 2 Nylon 6
14. X = Simple Cubic Lattice
Y = Face Centred Lattice
Z = Body Centred Cubic Lattice
Increasing order of number of metal atoms per unit cell of the above
Ans: X < Z < Y
15. Radius ratio of larger ion to smaller ion in trigonal shaped crystal of co-ordination No.3 is
Ans: 5
16. The colour given by excess Lithium in lithium chloride solid is
Ans: Pink
17. Any material can be made amorphous by quenching. This can be best explain by
Ans: Loss of long ranger order
18. Example of Pyroelectric substance is
Ans: LiNbO3
19. A. Diffusion of products
B. Diffusion of reactants
C. Transformation of reactants to products
D. adsorption of reactants
E. Desorption of Products
The sequence of steps in the adsorption theory of catalysis is
Ans: B, D, C, E, A
20. A: The conductivity of an insulator is in the order 10 -10 to 10 -28 ohm cm-1
B: The conductivity of a metal is in the order 108 ohm cm -1
Ans: Both A and B are true
21.
| List - X | List - Y |
| A. Gelatinous Al(OH)3 | (i) Electrovalent solid |
| B. Blue Vitriol | (ii) Covalent solid |
| C. Carborundum | (iii) Molecular solid |
| (iv) Amorphous solid |
The correct matching is
Ans: A-(iv) B-(i) C-(ii)
