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     EduGorilla 
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    Which of the following options is a displacement reaction?

    Options :-

    1. Fe(s) + 2HCl() FeCl2 + H2(g)
    2. 2Cu(s) + O2(g) 2CuO(s)
    3. Mg(s) + O2(g) MgO(s)
    4. 4Fe + 3O2 + xH2O 2Fe2O3 . xH2O
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