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Air contains maximum amount of

  • oxygen
  • nitrogen
  • hydrogen
  • carbon dioxide
Similar Questions :

1. The luster of a metal is due to :

  • high polishing
  • high density
  • chemical inertness
  • presence of free electrons

2. The single acid which dissolves gold is ?

  • Aqua regia
  • Hydrochloric acid
  • Nitric acid
  • Selenic acid

3. Mass number of a nucleus is :

  • the sum of the number of protons and neutrons present in the nucleus
  • always more than the atomic weight
  • always less than its atomic number
  • None of above

4. Rare gases are

  • mono atomic
  • di atomic
  • tri atomic
  • None of above

5. Bleaching action of chlorine is by

  • decomposition
  • hydrolysis
  • reduction
  • oxidation
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