In which of the following reactions,oxygen is | vedclass

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(D) $(i) \ 2 HOCl + H_2O_2 \longrightarrow 2 H_2O + Cl_2 + O_2$$(ii) \ 3 H_2O_2 + 2 KMnO_4 \longrightarrow 3 O_2 + 2 MnO_2 + 2 KOH + 2 H_2O$$(iii) \ H

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Reaction of lead sulphide with $H_2O_2$

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(D) $(i) \ 2 HOCl + H_2O_2 \longrightarrow 2 H_2O + Cl_2 + O_2$$(ii) \ 3 H_2O_2 + 2 KMnO_4 \longrightarrow 3 O_2 + 2 MnO_2 + 2 KOH + 2 H_2O$$(iii) \ H_2O_2 + I_2 + 2 OH^- \longrightarrow 2 I^- + 2 H_2O + O_2$$(iv) \ PbS + 4 H_2O_2 \longrightarrow PbSO_4 + 4 H_2O$In reaction $(iv)$,$PbS$ is oxidized to $PbSO_4$ by $H_2O_2$,but no oxygen gas is liberated.

In which of the following reactions,oxygen is not liberated?

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