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In which of the following reactions, oxygen is not liberated?
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Reaction of lead sulphide with $\mathrm{H}_2 \mathrm{O}_2$
(i) $2 \mathrm{HOCl}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{Cl}_2(g)+\mathrm{O}_2(g)$
(ii) $3 \mathrm{H}_2 \mathrm{O}_2+2 \mathrm{KMnO}_4 \longrightarrow 3 \mathrm{O}_2+2 \mathrm{MnO}_2$ $+2 \mathrm{KOH}+2 \mathrm{H}_2 \mathrm{O}$
(iii) $\mathrm{H}_2 \mathrm{O}_2+\mathrm{I}_2 \longrightarrow 2 \mathrm{HI}+\mathrm{O}_2$
(iv) $\mathrm{PbS}+4 \mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{PbSO}_4+4 \mathrm{H}_2 \mathrm{O}$
(ii) $3 \mathrm{H}_2 \mathrm{O}_2+2 \mathrm{KMnO}_4 \longrightarrow 3 \mathrm{O}_2+2 \mathrm{MnO}_2$ $+2 \mathrm{KOH}+2 \mathrm{H}_2 \mathrm{O}$
(iii) $\mathrm{H}_2 \mathrm{O}_2+\mathrm{I}_2 \longrightarrow 2 \mathrm{HI}+\mathrm{O}_2$
(iv) $\mathrm{PbS}+4 \mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{PbSO}_4+4 \mathrm{H}_2 \mathrm{O}$
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