Q4. Balance the following equations:
1. 3Fe +H₂O → Fe₂O + H2 => 3 Fe + 4H.
2.3 Ca + N2 - Ca3N2
3. Zn + KOH - K2ZnO2 + H2
4. PbO + NH3 - Pb + H2O + N2
5. S + H2SO4 - SO2 + H2O
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