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
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
To get n-type of semiconductor, germanium should be doped with
  • gallium
  • arsenic
  • aluminium
  • boron
p-type semiconductors are formed When Si or Ge are doped with
  • group 14 elements
  • group 15 elements
  • group 13 elements
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
A unit cell of BaCl
  • four Ba
  • eight Ba² ions and four Cl
  • four Ba² ions and six Cl
  • None of the above
0 h : 0 m : 1 s

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