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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Lithium has a bcc structure. Its density is 530 kg m-3 and its atomic mass is 6.94 g mol-1. Calculate the edge length of a unit cell of lithium metal. (NA = 6.02 x 1023 mol-1).

  • 352pm

  • 527pm

  • 264pm

  • 264pm

4637 Views

2.

A given metal crystallises out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom.

  • 40 pm

  • 127 pm

  • 80 pm

  • 80 pm

1388 Views

3.

If a is the length of the side of a cube, the distance between the body centred atom and one corner atom in  the cube will be

  • fraction numerator 2 over denominator square root of 3 end fraction a
  • fraction numerator 4 over denominator square root of 3 end fraction a
  • fraction numerator square root of 3 over denominator 4 end fraction a
  • fraction numerator square root of 3 over denominator 4 end fraction a
1548 Views

4.

The number of carbon atoms per unit cell of diamond unit cell is

  • 4

  • 8

  • 6

  • 6

1186 Views

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5.

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 (NA Avogadro's constant= 6.02 x 1023 mol-1)

  • 40 g mol-1

  • 30 g mol-1

  • 27 g mol-1

  • 27 g mol-1

3561 Views

6.

Which of the following statements about the interstitial compounds is incorrect?

  • They retain metallic conductivity

  • They are chemically reactive

  • They are much harder than the pure metal

  • They are much harder than the pure metal

945 Views

7.

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

  • 288 pm

  • 408 pm

  • 144 pm

  • 204 pm

551 Views

8.

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

  • 1

  • 3

  • 2

  • 4

852 Views

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9.

A structure of a mixed oxide is cubic close packed (ccp). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is

  • ABO2

  • A2BO2

  • A2B3O4

  • A2B3O4

3202 Views

10.

The correct statement regarding defects in the crystalline solid is 

  • Schottky defects have no effect on the density of crystalline solid

  • Frenkel defect decreases the density of crystalline solids

  • Frenkel defect is a dislocation defect

  • Frenkel defect is a dislocation defect

1736 Views

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