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PbS + 4HP2 → PbS04 + 4H20 (NTSE Delhi, Stage-I, 2015-16)
PbS - Oxidant H2O2 - Reductant
PbS - Reductant PbS04 - Oxidant
PbS - Reductant H20 2 - Oxidant
PbS - Reductant H20 - Reductant
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