Class XI

If a substance decomposes if heated to its boiling point, suitable method is
  1. Simple distillation
  2. Fractional distillation
  3. Vacuum distillation
  4. Crystallization
Aluminum (Al) is preferred in overhead power cables because
  1. it is a good conductor
  2. it acts as an insulator, in case of lightening
  3. it prevents accidents
  4. it is lighter in weight
 A particle may be
  1. an atom
  2. a molecule
  3. an isotope
  4. all of these
 Electrolysis refers to the
  1. Passing of cathode in molten solid
  2. Passing electricity through a solution or molten solid
  3. Substance that does not allow flow of electricity
  4. Copper plating of utensils
Greatest energy is found in particles of the
  1. Solids
  2. Liquids
  3. Gases
  4. Diffusing particles
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