The Solid State

Question 201
CBSEENCH12005549

The presence of F-centres in a solid makes it
  • conducting
  • colourless
  • coloured 
  • non-conducting

Solution

C.

coloured 
Question 202
CBSEENCH12005550

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

Solution

D.

arranged in planes.
Question 203
CBSEENCH12005551

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%

Solution

A.

74%
Question 204
CBSEENCH12005552

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

Solution

D.

Vacant

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