6. Balance the following equations:
(a) FeS + O2 -> FeO + SO2
(b) Cu2O + Cu2S -> Cu + SO2
(c) KMnO4 + H2SO4 + H2S ->K
2SO4 + MnSO4 + H2O + S
(d) N2 + H2 + NH3
(e) MgCl2 + Na2Co3 → MgCo3 + NaCl
(f) Hg(NO3)2 -> Hg + NO2 + O2
(g) KMnO4 -> K2 MnO4 + MnO2 +O2
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