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      Question

      Iron sheet kept in moist air covered with rust. Rust

      is 
      A An element Correct Answer Incorrect Answer
      B A compound Correct Answer Incorrect Answer
      C A mixture of iron and dust Correct Answer Incorrect Answer
      D A mixture of iron, oxygen and water Correct Answer Incorrect Answer

      Solution

      Rust is an iron oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture 4Fe+2O₂  +x H₂ O → 2Fe₂  O₃ - x H₃ O Hence rust is a compound. 

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