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The Diagram below is set-up for the laboratory preparation of oxygen gas.
Diagram on preparation of oxygen gas

  1. Name solid R
  2. Write an equation for the reaction that takes place in the flask.
  3. Give one commercial use of oxygen.

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  1. Manganese (IV) oxide. 
  2.                Manganese (IV) Oxide
    2H2O2(l)        arrow             O2(g) + 2H2O(l) + 2H2O(l)
  3.  
    1. Welding
    2. Steel making
    3. Breathing aid/ hospitals
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