Question

H2S → K2S → KHS → K2S → CuS → SO2
→ ZnSO3 → SO2;

Answer 1

K + H2S = K2S + H2
K2S + H2S = 2KHS 
KHS + KOH = K2S + H2O
K2S + CuCl2 = CuS + 2KCl
CuS + O2= CuO + SO2
ZnO + SO2 = ZnSO3
ZnSO3= ZnO + SO2 прокаливание

Answer 2

H2S+K2SO4=K2S+H2SO4
K2S+H2S=2KHS
KHS+KOH=K2S+H2O
K2S+CuSO4=K2SO4+CuS
2CuS+3O2=2SO2+2CuO
SO2+ZnO=ZnSO3
ZnSO3+H2SO4=SO2+ZnSO4+H2O