Question

Cuso4 cannot be stored in an iron container because

Answer 1

Iron is more reactive than Copper and hence Sulphate Ion prefers to stay with Iron. Now, if we store CuSO4 in an Iron Vessel, it will react with the Iron, which is something we don't want. Hence, you cannot store CuSO4 in an Iron Vessel. 

Answer 2

Because iron being more electropositive will displace cu2+ ions from cuso4 and will get oxidised dto fe2+ ions and hence cu2+ gets reduced to cut will start depositing...so cuso4 is not stored in fe container