Question

If a substance gains oxygen during a reaction, it is being oxidized. If it loses oxygen, it
is being reduced. Oxidation and Reduction always take place together, so that if one
substance is oxidized, another is reduced. Using this idea, say which substance is
oxidised and which substance is reduced in each reaction.
i) Mg + O2 2MgO
(s) (g) (s)
ii) ZnO + C Zn + CO
iii) Fe2 O3 + 3CO 2Fe + 3 CO2
iv) Cr2O3 + 2Al 2Cr + Al2 O3

Answer 1

so» substance oxidised
sr»substance reduced

i) so»Mg
sr»O2

ii) so»CO
sr»ZnO

iii)so»CO
sr»Fe2O3

iv)so»Al
sr»Cr2O3

hope it helped :)