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Rekha dropped a metal piece A in the solution of another metal B. After some time a new colour less compound C is formed. A,B,C respectively can be 

(1) Cu, ZnSO4, CusO4 

(2) Mg, NaCl, MgCl2 

(3) Mg, CuSO4, MgSO

(4) Fe, ZnSO4, FeSO4

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(3) Mg, CuSO4, MgSO

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