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Solid State Quiz-1

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The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..

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
Solution

 In ionic solids the shape of crystal depends upon relative size of ions. 
 Given,
 
  
 ∴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
Solution



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
  •   
  •   
  •  
  •  
Solution
 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
Solution
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
Solution
 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
Solution
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
Solution
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
Solution

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
Solution
This is the law of constancy of interfacial angles.

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

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