Discussion
Which of the following statements is/are correct ?
A. Iron can replace zinc from zinc sulphate solution.
B. Zinc can replace copper from copper sulphate solution.
C. Copper can replace Iron from Iron sulphate solution.
Answer: B
Only statement B is correct.
A more reactive metal displaces a less reactive metal from a solution of its salt. The reactivity order of these metals is zinc > iron > copper.
Zinc is more reactive than copper, so it displaces copper from copper sulphate solution, and the blue colour fades (B). Iron is less reactive than zinc, so it cannot displace zinc from zinc sulphate (A is wrong), and copper is less reactive than iron, so it cannot displace iron from iron sulphate (C is wrong).
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