Chemical changes are

  • reversible
  • irreversible
  • interchangeable
  • non interchangeable

If baking soda or fruit salt is mixed with vinegar, there takes place a

  • chemical reaction
  • physical reaction
  • transference
  • both a and b

Burning of fossils fuel results in the production of

  • bio gas
  • oxygen
  • carbon dioxide
  • nitrogen
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