What metal displaces iron from its salt solution: a) tin b) magnesium c) copper d) silver?

To answer this question, it is necessary to use a range of metal activities. Iron from a solution of its salt can displace those metals that are in this row to the left of iron, that is, more active than it. Of the four proposed metals (tin, magnesium, copper, silver), only magnesium is to the left of iron. This means that it is magnesium that will displace iron from the solution of its salt. Answer: b) magnesium.