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 * 1.ZnS04 + Cu **
 * 2.Al(SO4)3 + H2 **
 * 3.NaOH +H2 **
 * 4.ZnSO4 +H2 **
 * 5.Fe(NO3)2 + Cu **
 * 6.Mg(NO3)2 +H2 **
 * 7.Al2O3 + Fe **
 * 8.Ag + Cu(NO3)2 **
 * 9.Ca(OH)2 + H2  **