If a beaker is contained with the substances nickel sulfate, zinc sulfate and solid iron, there is a substance that will be reduced in the following substances that is in it. The substance that will be reduced as it is in the beaker is the Ni^2 + or also known as the Nickel (II)
In this case, the placed species are nickel (II) sulfate , zinc sulfate and solid iron . Now, as the nickel sulfate is more reactive than the zinc sulfate, it will experience the following reduction half-reaction from nickel (II) to solid nickel:
Nevertheless, it is possible that the zinc might experience the same reduction reaction from zinc (II) to solid zinc as well.