Solid State Quiz-1

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Q1. The ionic radii of Rb+ andI− are 1.46 Å and 2.16 Å. The most probable type of structure exhibited by it is
  •  CsCl type
  •  ZnS type
  •  NaCl type
  •  CaF2 type

 In ionic solids the shape of crystal depends upon relative size of ions. 
 ∴It will have coordination number 6 and structure will be same as of NaCl. 

Q2.Silver (atomic weight =) has a density of . The number of silver atoms on a surface of area  can be expressed in scientific notation as . The value of x is
  •  3
  •  5
  •  7
  •  9

Q3.  In the face centred cubic lattice, atom A occupies the corner positions and atom B occupies the
face centre positions. If one atom of B is missing from one of the face centred points, the formula of
the compound is
 Number of atoms (A) per unit cell =8×1/8=1
 Number of atoms (B) per unit cell =(6−1)×1/2=5/2
 (One atom B is missing)

Q4. A crystal may have one or more planes and one or more axes of symmetry but it possesses
  •  Two centres of symmetry
  •  One centre of symmetry
  •  No centre of symmetry
  •  None of the above
A crystal possesses only one centre of symmetry.

Q5.Doping of silicon (Si) with boron (B) leads to
  •  n−type semiconductor
  •  p−type semiconductor
  •  Metal
  •  Insulator
 Doping of silicon with boron leads to p−type semiconductor.

Q6. The ratio of cations to anion in a octahedral close packing is :
  •  0.414
  •  0.225
  • 0.02
  •  None of these
r+/r− for octahedral void = 0.414;
r+/r− for cubic = 0.732−1

Q7.For an ionic crystal of the general formula A+B− and co-ordination number 6, the radius ration will
be :
  •  Greater than 0.73
  •  Between 0.73 and 0.41
  •  Between 0.41 and 0.22
  •  Less than 0.22
The radius ratio for co-ordination and has 4, 6, and 8 lies in between the ranges [0.225−0.414], [0.414−0.732] and [0.732−1] respectively.

Q8.The cubic unit cell of Al (molar mass 27 g mol−1)has an edge length of 405 pm. Its density is
2.7 g cm−3. The cubic unit cell is
  •  Face centred
  •  Body centred
  •  Primitive
  •  Edge centred

For face centred cubic unit cell, number of atoms are 4.

Q9.The statement that, “The crystals of same substance can have different shapes depending upon the
number and size of faces but the angle between the corresponding faces remains constant” is known as:
  •  Hauy’s law of rationality of indices
  •  The law of constancy of interfacial angles
  •  The law of constancy of symmetry
  •  None of the above
This is the law of constancy of interfacial angles.

Q10. Which of the following will show anisotropy?
  •  Glass
  •  BaCl2
  •  Wood
  • Paper
Crystalline solids are anisotropic since, they exhibit different properties in all directions.

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