Class XII

Which among the following is an example of non – polar molecule?
  1. Diethyl ether
  2. Water
  3. Methane
  4. Ethyl alcohol
An atom located at the body center of a cubic unit cell is shared by
  1. 8 adjacent unit cells
  2. 4 adjacent unit cells
  3. 2 adjacent unit cells
  4. no other unit cells
Which among the following is not an example of amorphous solids?
  1. Coke
  2. Plastic
  3. Quartz
  4. Glass
Example of ferromagnetic substance is
  1. NaCl
  2. Co
  3. Fe3O4
  4. KMnO4
London forces are present in
  1. Non polar molecular solids
  2. Polar molecular solids
  3. None of these
  4. Hydrogen bonded molecular solidsF
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