11) H2S + O2 ─ H2O + SO2 ­ ;

12) Fe2O3 + H2 ─ Fe + H2O

13) CaCl2 + NaOH ─ Ca(OH)2 + NaCl;

14) H2 + O2 ─ H2O;

15) Zn + CuCl2 ─ Cu + ZnCl2 ;

16) NH3 ─ N2 + H2 ;

17) Cu + S ─ CuS ;

18) AgF + NaCl ─ AgCl + NaF ;

19) CaCO3 ─ CaO + CO2↑;

20) CuBr2 + NaOH ─ Cu(OH)2 + NaBr ;

21) Fe + H2O ─ H2↑ + Fe2O3 .



 


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