A chemical reaction in which a more reactive element displaces a less reactive element from its aqueous salt solution is known as ___________.

• A chemical reaction in which a more reactive element displaces a less reactive element from its aqueous salt solution is known as a displacement reaction. 
• For example, when iron nails are immersed in copper sulphate solution, the iron nail becomes brownish and colour and also the copper sulphate solution loses a little colour. This is because iron is able to displace copper sulphate from the solution. The reaction is as follows:

             Fe(s) + CuSO₄(aq) → FeSO₄ (aq) + Cu(s)