Class XI

Sodium metal is kept under
  1. petrol
  2. alcohol
  3. water
  4. kerosene
Which metal pollute the air of a big city?
  1. Copper
  2. Chromium
  3. Lead
  4. . Cadmium
Monazite is an ore of
  1. titanium
  2. zirconium
  3. iron
  4. thorium
Isotopes are separated by
  1. crystallisation
  2. sublimation
  3. . distillation
  4. filtration
Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
  1. Television
  2. . Refrigerator
  3. Tube light
  4. Cooking gas
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