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2022

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17. The bulk modulus of an ideal gas at constant temperature

(a)  Is equal to its volume V     (b)   Is equal to p/2 (c)  Is equal to its pressure p  (d)  ...
16.Coefficient of isothermal elasticity Eθ and coefficient of adiabatic elasticity E∅ are related by (λ = CP/CV) (a)Eθ = λE∅ ...

The crystal structure of solid Mn(II) oxide is

a. NaCl structure b. Fe2 O3  structure c. CaF2 structure d. Na2 O structure Ans. a (37)

In calcium flouride having the fluorite structure, the coordination numbers for calcium ion and fluoride ion are

a.  6, 6 b. 8, 4 c. 4, 4 d. 4, 8 Ans. b (8)

What is the coordination number of sodium in

Na2 O a. 6 b. 4 c. 8 d. 2 Ans. b (24)

30. The resultant of the system in the figure is a force of 8N parallel to the given force through R . The value of PR equals to

(a) 1/4  RQ (b) 3/8 RQ (c)  3/5 RQ (d) 2/5 RQ Ans. c (107)

Which set of characteristics of ZnS crystal is correct

a. Coordination number ( 4 : 4); ccp;  Zn++   ion in the alternate tetrahedral voids b. Coordination number ( 6...

If the distance between

Na + and Cl – ions is sodium chloride crystal is X pm, the length of the edge of the unit cell...

A solid compound contains X,Y and Z atoms in a cubic lattice with X atoms occupying the corners. Y atoms in the body centered positions and Z atoms at the centres of face of the unit cell. What is the empirical formula of the compound

a. XY2  Z3 b. XYZ3 c. X2 Y2 Z3 d.  X8 YZ6 Ans. b (14)

If the pressure on a NaCl structure is increased then its coordination number will

a. Increase b. Decrease c. Remain the same d. Either (b) or (c) Ans. a (13)

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (y-) will be

a. 241. 5 pm b. 165. 7 pm c. 275.1 pm d. 322. 5 pm Ans. a (11)

The radii of

Na+ and Cl– ions are 95 pm and 181 pm respectively. The edge legth of NaCl unit cell is a....

In the closest packed structure of a metallic lattice, the number of nearest neightbours of a metallic atoms is

a. Twelve b. Four c. Eight d. Six Ans. a Explanation : Coordination number in hcp and ccp arrangement is...

Radius ration of an ionic compound is 0.93. The structure of the above ionic compound is of

a.  NaCl type b. CsCl type c. ZnS type d. None of these Ans. b Explanation : Radius ration range...

The unit cell of a binary alloy composed of A and B metals, has a ccp structure with a atoms occupying the corners and B atoms occupying centres if each face of the cube. If during the crystalization of this alloy, in the unit cell two A atom are missed the overall composition per unit cell is

a. AB6 b. AB4 c. AB8 d. AB24 Ans. b (66)

The interionic distance for cesium chloride crystal will be

a. a b. a/2 c. √3a/2 d. 2a/√3 Ans. c Explanation : As CsCl is body-centred d = √3a/2 (14)

An example of fluorite structure is

a. NaF b. SrF 2 c. AlCl 3 d.SiF4 Ans.b Explanation : SrF 2  has fluorite type structure. (10)

A metal crystallizes in a face centred structure. If the edge length of its unit cell is ‘a’ the closest approach between two atoms in metallic crystal will be

a. 2√2a b. √2a c.a / √2 d. 2a Ans. c (6)

A solid having density of

9 x 103  kg m-3  forms face centred cubic crystals of edge length  200 √2  pm. What is the molar...

15. The isothermal bulk modulus of a gas at atmospheric pressure is

(a)   1 mm of Hg                           (b)   13.6 mm of Hg (c)  1.013×105 N/m2             ...

Body centered cubic lattice has a coordination number of

a. 4 b. 8 c. 12 d. 6 Ans. b Explanation : Body centered cubic lattice has a coordination number...

14. A ball falling in a lake of depth 200 m shows 0.1% decrease in its volume at the bottom. What is the bulk modulus of the material of the ball

(a)  19.6×108 N/m2                           (b)  19.6×10-10  N/m2 (c)  19.6×1010 N/m2 ...

13. A uniform cube is subjected to volume compression. If each side is decreased by 1%, then bulk strain is

(a)  0.01                                     ...

A solid has a structure in which ‘W’ atoms are located at the corners of a cubic lattice ‘O’ atoms at the centre of edges and Na atoms at the centre of the cube. The formula for the compound is

a. NaWO2 b. NaWO3 c. NaWO3 d. NaWO4 Ans. b   (8)

12. Bulk modulus was first defined by

(a)   Young                                              (b)   Bulk (c)   Maxwell                             ...
10. When a pressure of 100 atmosphere is applied on a spherical ball, then its volume reduces to 0.01%. The...

In the cubic close packing the unit cell has…….

a. 4 tetrahedral voids each of which is shared by four adjacent unit cells. b. 4 tetrahedral voids within the...

At

100° C , copper (Cu) has fcc unit cell structure with cell edge length of  x Å. What is the...

In metallic solids the number of atoms for the face centered and the body centered cubic unit cells are respectively

a.  2, 4 b. 2, 2 c. 4, 2 d. 4, 4 Ans. c (5)
9. The compressibility of a material is (a)   Product of volume and its pressure (b)   The change in pressure per...

The number of atoms in 100 g of an fcc crystal with density d = 10 g/cm ^3 and cell edge equal to 100 pm is equal to

a.  4 x 10 25 b. 3x 1025 c. 2x 1025 d. 1x 1025 Ans. a (7)

Bragg’s law is given by the equation

a. nλ = 2 θ  sin θ b. nλ = 2d sin θ c.  2nλ = dsin θ d.  n...

CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being =

6.023 x 1023  mol -1  CsBr. the density of CsBr is a. 8.25 g/ cm3 b. 4.25 g/cm3 c. 42.5g /cm3 d....

Total volume of atoms present in face- centred cubic unit cell of a metal is (r is atomic radius)

a. 20/3 (πr 3 ) b. 24/ 3 (πr 3 ) c. 12/3 (πr 3 ) d. 16/3 (πr 3 ) Ans. d (13)

1. The fraction of total volume occupied by the atoms present in a simple cube is

a. π/6 b. π 3√2 c. π /4√2 d. π/ 4 Ans. a (8)

An ionic compound is formed between a metal M and a non metal Y. If M occupies half the octahedral voids in the cubic close packed arrangement formed by Y, the chemical formula of the ionic compound is

a. My b. My 2 c. M 2  Y d. MY 3 Ans. b (7)

In a cubic close packed structure, fractional contributions of an atoms at the corner and at the face in the unit cell are respectively

a.  1/8 and 1/2 b. 1/2 and 1/4 c. 1/4 and 1/2 d. 1/4 and 1/8 Ans. a (11)

Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2

a. 65% b. 45% c. 90% d. 75% Ans. c (13)

In NaCl unit cell all the ions lying along the axis as shown in the figure are removed. Then the number of

Na+  and Cl – ions remaining in the unit cell are a. 4 and 4 b. 3 and 3 c. 1...

The packing efficiency of the two dimensional square unit cell shown below is

a. 39.27 % b. 68.02% c. 74.05 % d. 78. 54 % Ans. d (7)

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