Study

Oxygen Gas

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  • is there Oxygen in the Air ? How much ?
    Yes, 21%
  • The ratio of O₂ gas in the atmosphere is fixed. Right or wrong?
    Right
  • Which gas represents one fifth of the atmosphere.
    Oxygen
  • Which gas do we need to breathe?
    Oxygen
  • Oxygen gas is composed of 3 atoms ?
    Wrong, only two atoms.
  • Is Oxygen solid, liquid or gas ?
    It is a gas.
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