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 Form 1 Chemistry Topical Questions and Answers on Air and Combustion

The diagram below shows an iron bar which supports a bridge. The iron bar is connected to a piece of magnesium metal.
Explain why it is necessary to connect the piece of magnesium metal to iron metal

 (3m 17s)
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Answer Text:
Magnesium is above iron in the reactivity series. It supplies electrons to the iron bar hence preventing it from rusting