CBSE  /  Class 12  /  Chemistry  /  The Solid State

  • 1. 
    In which pair most efficient packing is present?

  • hep and bcc
  • hep and ccp
  • bcc and ccp
  • bcc and simple cubic cell

  • 2. 
    What is the effect of Frenkel defect on the density of ionic solids?

  • The density of the crystal increases
  • The density of the crystal decreases
  • The density of the crystal remains unchanged
  • There is no relationship between density of a crystal and defect present in it

  • 3. 
    In a Schottky defect

  • an ion moves to interstitial position between the lattice points
  • electrons are trapped in a lattice site
  • some lattice sites are vacant
  • some extra cations are present in interstitial space

  • 4. 
    To get n-type of semiconductor, germanium should be doped with

  • gallium
  • arsenic
  • aluminium
  • boron

  • 5. 
    p-type semiconductors are formed When Si or Ge are doped with

  • group 14 elements
  • group 15 elements
  • group 13 elements

  • 6. 
    Which of the following conditions favours the existence of a substance in the solid state?

  • High temperature
  • Low temperature
  • High thermal energy
  • Weak cohesive forces
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