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Identify the correct displacement reaction

1. CuSo4+Au= AuSo4+Cu
2. FeSo4+Zn= ZnSo4+Fe
3.CuSo4+Pb=PbSo4+Cu
4. 3ZnSo4+2Al=Al2(So4)3+3Zn
5. PbSo4+Fe=FeSo4+Pb
6. NaNo3+zn=NaNo3+Na
7. Kno3+Na=NaNo3+k
8. NaNo3+k= kno3+na
9. Znso4+fe= feso4+zn
10. Auso4+cu= cuso4+au
11. Mgso4+cu= cuso4+mg
12. Mg+cuso4= mgso4+cu
13. MgO+zna= Na2O+mg
14. Na2O+mg= 2Na+Mgo
15. H2SO4+zn= znSo4+H2
16. H2So4+Hg= HgSo4+H2
17. H2So4+Mg= MgSo4+H2
18. 2Hcl+zn= zncl2+H2
19. Fe+2Hcl+ Fecl2+H2
20.Mg+zn(No3)2= Mg(No3)2+zn