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A mixture of magnesium powder and lead oxide will react vigorously when heated but no reaction occurs when a mixture of magnesium oxide and lead powder are heated.

  1. Explain the observation. 
  2. Which of the two substances, magnesium or lead oxide is:
    1. Oxidized in the reaction? 
    2. The oxidizing agent? 

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  1. Magnesium is more reactive than lead hence removes oxygen from lead oxide while lead cannot remove oxygen from magnesium oxide hence no reaction.
  2.   
    1. Magnesium.
    2. Lead oxide.
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