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FeCl3 (aq) + H2S(g)  FeCl2(aq) + S(s) + HCl(g)
Na2SO4(aq) + BaCl2(aq)  BaSO4(s) + NaCl(aq)
Zn(s) + CuSO4(aq)  ZnSO4(aq) + Cu(s)
CuO(s)+CO(g)  Cu(s) + CO2(g)
ANS : 2
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