Explain how the displacement of iron from iron oxide is used to weld rails together?
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Answer: The metal Reactivity Series can be obtained by reacting a metal with a compound of another metal. Quite simply, either there is a reaction or there isn't! For a reaction to occur, that is, for one metal to displace another metal from its compounds, the added metal must be higher in the series than the metal in the compound. You can also use the non-metals hydrogen and carbon (either as coke, charcoal or carbon monoxide). If it doesn't involve a salt solution you need to heat the mixture.
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