which of the followingdisplacent reactions is not possible? (1)pb+cucl2----pbcl2+cu (2)fe+cuso4---feso4+cu (3)cu+znso4-----cuso4+zn (4)zn+agno3-----znno3+ag
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number 3 is not possible as Cu is less reactive than zinc
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3
4 th one is the anss
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