Question

state whether the bracket substance in each case has undergone oxidation or reduction giving reasons for your answers
1.(PbO2)+4 HCI----->PbCl2+ 2H2O + Cl2
2.SO2 +(CI2)+H2O----->2HCI+H2SO4
3.(S)+ 6HNO3-->H2SO4+6NO2+H2O
4.Fe2O3+3(CO)--->2Fe+3co2
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Answer 1

oxidation means gain of electrons to compllete ita octet

reduction means loss of electrons to complete its octet

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Answer 2

I don't know answer...