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The most abundant rare gas in the atmosphere is ?

  • He
  • Ne
  • Ar
  • Xe
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1. What is Calcium sulphate ?

  • epsom salt
  • blue vitriol
  • gypsum salt
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2. Homo nuclear molecules contain ?

  • polar bond
  • covalent bond
  • ionic bond
  • coordinate bond

3. How many different oxides are formed by nitrogen ?

  • two
  • three
  • four
  • five

4. What is laughing gas ?

  • nitrous oxide
  • nitric oxide
  • nitrogen oxide
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5. Which gas is filled in refrigerators ?

  • Chlorofluorocarbon
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