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Fe+CuSO4=FeSO4+Cu this reaction is which type reaction?

   There are so many kinds of reactions and all these can be placed into four basic categories: combination, decomposition, single replacement and double replacement reactions.

Fe + CuSO₄ => FeSO₄ + Cu

This is single replacement or single displacement reaction. in this type one element will be replacing the other, when this happens a new compound is formed and an element is released.

The general formula for this reaction is:   A + BX => AX + B