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Answer 1

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Magnesium is the most reactive among the three metals and zinc is more reactive than copper. So, magnesium will displace zinc oxide and copper oxide whereas zinc will displace copper oxide only. Copper being the least reactive will not be able to displace any of them.(look at the pic)

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Magnesium oxide will not give displacement reaction with any of zinc, magnesium and copper.

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Both zinc and magnesium can give displacement reactions with copper oxide. This is because, both zinc and magnesium are more reactive than copper.

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Answer 2

Magnesium (Mg) will displace both zinc (Zn) and copper (Cu) from their oxides.

• Mg+ ZnO —> MgO + Zn
• Mg +CuO —> MgO + Cu

Zinc will displace copper from copper oxide.

• Zn + CuO —> ZnO +Cu

Copper is least reactive and will not participate in

displacement reaction.