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Why should a magnesium ribbon be cleaned...

Why should a magnesium ribbon be cleaned before is burnt in air ?

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Magnesium is a very reactive metal when stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air.
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Knowledge Check

  • A piece of magnesium ribbon was heated to redness in an-atmosphere of nitrogen and on cooling water was added, the gas evolved is

    A
    Hydrogen
    B
    Oxygen
    C
    Nitrogen
    D
    Ammonia

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    Ahmad took a magnesium ribbon and burned it on a flame. The white powder formed was taken in a test tube and water was added to it. He then tested the solution formed with red and blue litmus paper. What change was seen ? Why ?

    Write balanced equation for the following reactions and also name the type of chemical reaction in each case : (i) Magnesium ribbon is burnt in air . (ii) Lime stone is heated.

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