Class XI

Balloons are filled with
  1. nitrogen
  2. helium
  3. oxygen
  4. argon
Amalgams are
  1. highly coloured alloys
  2. alloys which contain mercury as one of the contents
  3. alloys which have great resistance to abrasion
  4. . alloys which contain carbon
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
Which of the following is not an isotope of hydrogen?
  1. Tritium
  2. Deuterium
  3. Protium
  4. Yttrium
Isotopes are separated by
  1. crystallisation
  2. sublimation
  3. . distillation
  4. filtration
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