Balance the following equations. i) Pb(NO₃)₂ + Na₂SO4 → NaNO₃ + PbSO4 ii) Fe₂O₃ + H₂ → Fe + H₂O iii) Zn + NaOH → Na₂ZnO₂ + H₂ iv) Al + H₂SO4 → Al₂(SO4)₃ + H₂ v) NH₃+ O₂ → NO + H₂O
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i) Pb(NO₃)₂ + Na₂SO4 → 2NaNO₃ + PbSO4
ii) Fe₂O₃ + 3H₂ → 2Fe + 3H₂O
iii) Zn + 2NaOH → Na₂ZnO₂ + H₂
iv) 2Al + 3H₂SO4 → Al₂(SO4)₃ + 3H₂
v) 2NH₃+ 3O₂ → 2NO + 3H₂O
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