Question

Метод электронного баланса :
Zn+H2SO4→ZnSO4+S+H2O
K+H2SO4→K2SO4+H2S+H2O
SO2+H2S→S+H2O
Cl2+NaOH→NaCl+NaClO3+H2O

Answer 1

1.3Zn+4H2SO4=3ZnSO4+S+4H2O
Zn 0 -2e Zn+2|6|3
S+6 +6e S 0|2|1
2.8K+5H2SO4=4K2SO4+H2S+4H2O
K 0 -1e K+1|8
S +6 +8e S-2|1
3.SO2+2H2S=3S+2H2O
 S+4 +4e S 0|2|1
 S-2 -2e S0|4|2
 4.3Cl2+6NaOH=5NaCl+NaClO3+3H2O  
 Cl2 0 +2e 2Cl-1|10|5
CL2 0 -10e 2Cl+5|2 |1