Question

what chemical does make a copper coin to repel an iron needle​

Answer 1

Explanation:

reactions of metals with its salt solutions

if copper coins is taken to repel iron take iron sulphate solution

Answer 2

Answer:

Reactivity of some metals are given in descending order

K > Na > Ca > Mg > Al > Zn > Fe > Pb > Cu

Copper does not have a higher reactivity than iron. Since copper is less reactive than iron, it does not displace iron from its solution. A less reactive metal is displaced from a solution by a more reactive metal.