Which of the following options is a displacement reaction?….

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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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