If the distance between Na+ and CI ions in NaCl crystal is a pm, what is the length of the cell edge?
  • 2a pm 
  • a / 2 pm
  • 4a pm
  • a/4 pm


A.

2a pm 
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CsCl has which type of lattice?
  • SC
  • fcc
  • bcc

  • hcp

C.

bcc

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The tetrahedral voids formed by ccp arrangement of CI ions in rock salt structure are:
  • Occupied by Na+ ions
  • Occupied by CI ions
  • Occupied by either Na+ or CI ions
  • Vacant

D.

Vacant
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Most crystals show good cleavage because their atoms, ions and molecules are
  • Weakly bonded together
  • strongly bonded together
  • spherically symmetrical
  • arranged in planes.

D.

arranged in planes.
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The available space occupied by spheres of equal size in three dimensions in both hcp and ccp arrangements is:
  • 74%
  • 70%

  • 60.4%

  • 52.4%


A.

74%
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