Chemistry
State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced.
(a) PbO + CO ⟶ Pb + CO2
(b) Mg + 2HCl ⟶ MgCl2 + H2
(c) H2S + Cl2 ⟶ 2HCl + S
(d) Cl2 + H2S ⟶ 2HCl + S
Hydrogen
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Answer
(a) PbO is reduced, due to removal of oxygen.
(b) Mg is oxidised, due to loss of electrons.
(c) H2S is oxidised, as hydrogen is lost to give sulphur.
(d) Chlorine is reduced, due to addition of hydrogen to form HCl.
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