Which one of the following reactions does not form a gaseous product?
- A$PbO_2 + H_2O_2 \longrightarrow PbO + H_2O + O_2$
- B$2KMnO_4 + 3H_2SO_4 + 5H_2O_2 \longrightarrow K_2SO_4 + 2MnSO_4 + 8H_2O + 5O_2$
- C$PbS + 4H_2O_2 \longrightarrow PbSO_4 + 4H_2O$
- D$Cl_2 + H_2O_2 + 2OH^- \longrightarrow 2Cl^- + 2H_2O + O_2$
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