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7.Metals reacts with atmospheric oxygen and produces metal oxides that are basic in nature because they react with water to form bases. In case of rusting of iron, the iron reacts with the oxygen present in air and moisture and develops rust (hydrated iron (III) oxide).
formula:Fe2o3
8.
a. At cathode hydrogen and at anode Oxygen
b. The gas which is collected in double amount during the electrolysis is Hydrogen. This is because water contains two parts of element as compared to one part of oxygen element by volume.
c. If H2SO4 is not added to water, the conductivity of water will remain low resulting in slow electrolysis.
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