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  1. When iron rusts, its weight

    2. A.

     Decreases
    B.

     Increases
    C.

     Remains the same
    D.

     First increases and then decreases

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    Answer : Option B

    Explanation :

    When iron or any other metal oxidizes, oxygen from the air combines with the iron to make iron oxide or rust. So, weight of the bar increases, due to the increased weight of oxygen which has combined with the iron.

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