JAMB - Chemistry (1984 - No. 10)
In which of the following reactions does hydrogen peroxide act as a reducing agent?
H2S + H2O2 \(\to\) S + 2H2O
PbSO3 + H2O2 \(\to\) PbSO4 + H2O
2I+ 2H+ + H2O2 \(\to\) I2 + 2H2O
PbO2 + 2HNO3 + H2O2 \(\to\) Pb(NO3)2 + 2H2O + O2
SO2 + H2O2 \(\to\) H2SO4