Which of these metals can displace all other three metals from their salt solution
(a) iron
(b) silver
(c) gold
(d) none of them
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All the three metals - copper, silver and gold - are less reactive than iron and are placed below iron in the reactivity series. Therefore, none of the three metals can displace iron from its salt solution. Hence, we observe that no reaction takes place and none of the pieces get coated.
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