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CuO(S) + C(s) Cu(s) + CO(g)
Cl2(g) + 2Na(s) 2NaCl(g)
CuSO4(aq) + Zn(s) Cu(s) + ZnSO4(aq)
2FeCl3(aq) + SnCl2(aq) 2FeCl2(aq) + SnCl4
ANS : 3
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