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solid state Quiz-11

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Q1. The yellow colour of and conducting nature produced in heating is due to
  •  Metal excess defects due to interstitial cation
  •  Extra positive ions present in an interstitial site
  •  Trapped electrons
  •  All of the above
Solution
These are characteristics of metal excess defects due to interstitial cation.

Q2. Which is ferromagnetic?
  •  mangnetic field
  •  copeer
  •  neon
  •  iron field
Solution
Ferromagnetics are the substances which are strongly attracted in magnetic field and retain magnetism in absence of magnetic field

Q3.  Which arrangement of electrons leads ferromagnetism?
  •   ↑ ↑ ↑ ↑
  •  ↑ ↓ ↑ ↓
  •  ↑ ↑ ↑ ↓ ↓
  •  None of these
Solution
Ferromagnetism is due to spontaneous alignment of the magnetic dipoles in same direction

Q4. The unit cell with the structure below refers to……crystal system
  •  Cubic
  •  Orthorhombic
  •  Tetragonal
  •  Trigonal
Solution
Note that and the conditions for orthorhombic system.

Q5.The fraction of total volume occupies by the atoms present in a simple cube is :
  •  acid
  •  ions
  •  sodium
  •  copper
Solution
 Volume of cube = Volume of unit cell = ∴ packing density

Q6. In an antifluorite structure, cations occupy
  •  Octahedral voids
  •  Centre of cube
  • Tetrahedral voids
  •  Corners of cube
  • Solution
    In antifluorite structure, the anions are oxide ions. The oxide ions form a face centred cubic array and the metal ion (cation) fill half of the tetrahedral voids. .,

    Q7. The structure of is similar to . The co-ordination number of is :
    •  2
    •  6
    •  4
    •  8
    Solution
    has 6 co-ordination number (fcc structure).

    Q8. The phenomenon in which crystals on subjecting to a pressure or mechanical stress produce electricity is called :
    •  Pyro-electricity
    •  TPiezo-electric effect
    •  Ferro-electricity
    •  Ferri-electricity
    Solution
    It is the definition of piezo-electric effect or piezo-electricity.

    Q9. The statement that, “It is possible to choose along the three co-ordinate axes unit distance not necessarily of the same length, such that the ratio of there intercepts of any plane in the crystal is given by in where are either integral whole numbers including infinity or fraction of whole number” 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 Hauy’s law of rationality of indices

    Q10. Crystals which are good conductor of electricity and heat are known as :
    •  Ionic crystals
    •  Covalent crystals
    •  Metallic crystals
  • Molecular crystal
  • Solution
    Metallic crystals are good conductor of heat and current due to free electrons on them

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