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2022

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A compound is formed by cation C and antion A . The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compounds is

a. C 4  A 3 b. C2  A3 c.  C 3 A  2 d.  C 3 A 4 Ans. d (8)

The radius of the largest sphere which fits properly at the centre of the edge of body centred cubic unit cell is : (Edge length is represented by ‘a’)

a. 0.047 a b. 0.027 a c. 0.134 a d. 0.067 a Ans. d (12)

Iron exhibits bcc structure at room temperature. Above

900º  C It transforms to fcc structure. the ratio of density of iron at room temperature to that at 900...

Total no. of voids in o.5 mole of compound forming hexagonal closed packed structure are

a. 6. 022 x 1023 b. 3. 011 x 1023 c. 9. 033 x 1023 d. 4. 516 x 1023...

Which of the following statements is not correct

a. The number of carbon atoms in an unit cell of diamond is 4 b. The number of bravais latties...

Given that the radius of

Na+  ion is 0.95  Å and that of Cl–  ion is 1.81 Å   hence in the close packed lattice of...

The edge length of face centred unit cubic cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

a. 285 pm b. 398 pm c. 144 pm d. 618 pm Ans. c (12)

In face centred cubic unit cell, what is the volume occupied

a. 4/3 π r 3 b.  8/3 π r 3 c. 16/3 π r 3 d. 64π r 3   / 3√3 Ans. c (9)

The contribution of particle at the edge centre of a particular unit cell is

a. 1/2 b. 1/4 c. 1 d. 1/8 Ans. b (34)

CsCl crystallizes in body centred structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be

a.  r  cs +    + r cl-    = 3a b. r  cs +    + r cl-    = 3a/...

Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be

a. 75 pm b. 300 pm c. 240 pm d. 152 Ans. d (6)

A metal crystallizes with a face – centered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is

a. 288 pm b. 408 pm c. 144 pm d. 204 pm Ans. a (16)

AB crystallizers in a body centred cubic lattice with edge length ‘a’ equal to 387 pm. The distance between two oppositively charged ions in the lattice is

a.  300 pm b. 335 pm c. 250 pm d. 204 pm Ans. b (11)

Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom

a. 108 pm b. 127 pm c. 157 pm d. 181 pm Ans. b (11)

Sodium metal crystallizes in a body centred cubic lattice with a until cell edge of 4.24 Å . The radius of sodium atom is approximately

a.  1. 86 Å b. 3.22 Å c. 5.72 Å d. 0.93 Å Ans. a (4)

CsBr crystal has bcc structure. It has an edge lenght of 4. 3 Å The shortest interionic distance between

Cs + and  Br –  ions is a. 1. 86 Å b. 3.72 Å c. 4. 3 Å d. 7. 44 Å...

The number of octahedral void (s) per atom present in a cubic close packed structure is

a. 1 b. 3 c. 2 d. 4 Ans. a Explanation : Number of octahedral voids in ccp, is equal...

Three elements A, B and C crystallize into a cubic solid lattice. Atoms A occupy the corners, B atoms, the cube centres and C atoms the edge centres. The formula of the compound is

a.  ABC b. ABC 2 c. ABC 3 d. ABC 4 Ans. c (8)

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre position. If one atom of B is missing from one of the face centred points, the formula of the compound is

a.  A2  B b. AB 2 c. A2 B3 d. A 2B5 Ans. d (11)

The ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be

a. A B b. A 2B c.  A B 3 d. A 3 B Ans. c (7)

The ration of close packed atoms to tetrahedral holes in cubic close packing is

a. 1 : 1 b. 1 : 2 c. 1 : 3 d. 2 : 1 Ans. b (9)

Hexagonal close packed arrangement of ions is described as

a. ABC ABA b. ABC ABC c. ABABA d. ABBAB Ans. b Explanation : As, a = b not =...

An

AB 2  type structure is found in a. Nacl b. Al2 O 3 c. CaF 2 d. N 2 O Ans. c (7)

If ‘Z’ is the number of atoms in the unit cell that represents the closest packing sequence — A B C A B C —, the number of tetrahedral voids in the unit cell is equal to

a.  Z b. 2 Z c. Z/2 d. Z/4 Ans. b Explanation : Number of tetrahedral voids in the unit...

The arrangement ABC ABC ABC…. is referred as

a. Octahedral close packing b. Hexagonal close packing c. Tetragonal close packing d. Cubic close packing Ans. d Explanation :...

The vacant space in bcc lattice cell is

a. 26 % b. 48 % c. 23 % d. 32 % Ans. d Explanation : Packing efficiency in bcc...

29. A force of 

(2^i-4^j+2^k)N acts at a point  metre(3^i +2^j-4^k)  from the origin. The magnitude of torque is (a) Zero (b)  24.4 N-m...

In CsCl structure the coordination number of

Cs +   is a. Equal to that of Cl –  , that is 6 b. Equal to that of Cl –  , that...

In a solid ‘AB’ having the NaCl structure ‘A’ atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

a. AB2 b. A 2 B c. A4  B 3 d.  A 3 B 4 Ans. d (32)

Which of the following statements is not true about NaCl structure

a. Cl–   ions  are in fccarrangement b. Na+  ions has coordination  number 4 c. Cl–  ions has coordination numnber 6...

What is the coordination number in a square close packed structure in two dimensions

a. 2 b. 3 c. 4 d. 6 Ans. c (18)

In which of the following structures coordination number for cations and anions in the packed structure will be same

a. Cl –  ions form fcc lattice and Na+   ions occupy all octahedral voids of the unit cell b. Ca 2+ ions...

The ionic radii of

Rb+ and I–  are 1.46 Å  and 2.16 Å . The most probable type of structure exhibited by it is...

In Zincblende structure, zinc atom fill up

a. All octahedral holes b. All tetrahedral holes c. Half number of octahedral holes d. Half number of tetrahedral holes...

The ionic radii of

A+and B–  ions are 0.98 x 10-10  m and  1.81 x 10  m-10 . The coordination number of each ion...

Postassium has a bcc structure with nearest neighbour distance 4.52 Å . Its atomic weight is 39. Its denstiy will be

a.  454 b. 804 c. 852 d. 908 Ans. d (9)

The cubic unit cell of a metal (molar mass =

63. 55g mol -1 ) has an edge length of 362 pm. Its denstiy is 8.92g cm -3  . The type of unit...

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is

2.72 g cm -3   . The molar mass of the metal is a. 20 g mol -1 b. 40g mol -1 c. 30...

An element crtstallising in body centred cubic lattice has an edge lengths of 500 pm. If its density is 4 g cm ^-3, the atomic mass of the element is

a. 100 b. 250 c. 125 d. 150 e. 50 Ans. d (11)

An element (atomic mass 100 g/mol ) having bcc structure has unit cell edge 400 pm. Then density of the element is

a. 10.376 g/cm3 b. 5.188 g/ cm3 c. 7.289 g/cm3 d. 2.144 g/cm3 Ans. b (10)

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