Class XII

Which crystal system has axial angles equal to 90o90o?
  1. Hexagonal
  2. Orthorhombic
  3. Monoclinic
  4. Rhombohedral
Example of ferromagnetic substance is
  1. NaCl
  2. Fe3O4
  3. Co
  4. KMnO4
Which among the following is not an example of amorphous solids?
  1. Coke
  2. Plastic
  3. Quartz
  4. Glass
London forces are present in
  1. Non polar molecular solids
  2. Polar molecular solids
  3. None of these
  4. Hydrogen bonded molecular solidsF
Solid X is a very hard electrical insulator in solid as well as in molten state. It melts at extremely high temperature. Solid X is a
  1. covalent solid
  2. metallic solid
  3. molecular solid
  4. ionic solid
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