Important Questions of The Solid State Chemistry | Zigya

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61.

The cubic unit cell of a metal (molar mass = 63.55g mol-1) has an edge length of 362 pm. Its density is 8.92g cm-3. The type of unit cell is

  • primitive

  • face centred

  • body centred

  • end centred


62.

The number of unit cells present in 39 g of potassium if it crystallizes as body centred cube is (N = Avogadro number, At. wt. of potassium = 39)

  • N4

  • N2

  • N3

  • N


63.

The number of octahedral and tetrahedral holes respectively present in a hexagonal close packed (hcp) crystal of 'X' atoms are

  • X, 2X

  • X, X

  • 2X, X

  • 2X, 2X


64.

Which one of the following elements, when present as an impurity in silicon makes it a p-type semiconductor?

  • As

  • P

  • In

  • Sb


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65.

Structure of NaCl crystal is

  • tetragonal

  • cubic

  • orthorhombic

  • monoclinic


66.

Bravais lattices are of

  • 8 types

  • 12 types

  • 14 types

  • 9 types


67.

Point defects are present in

  • ionic solids

  • molecular solids

  • amorphous solids

  • liquids


68.

An element has a body centered cubic structure with a unit cell edge length of 400 pm. Atomic mass of an element is 24 g mol-1. What is the ·density of the element? (NA = 6 × 1023 mol-1)

  • 2.50 g cm-3

  • 1.80 g cm-3

  • 3.60 g cm-3

  • 1.25g cm-3


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69.

The number of octahedral sites per sphere arranged in a face centred cubic structure, is

  • 1

  • 2

  • 3

  • 4


70.

Which one of the following has Frenkel defect?

  • sodium chloride

  • Graphite

  • Siliver Bromide

  • Diamond


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