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05/11/2020 4:58 pm
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(a) Give two methods to prevent the rusting of iron.
(b) Name the ores of the following metals:
(i) mercury, and
(ii) zinc
(c) Explain with the help of a diagram, how copper metal can be refined? Label the important arrangements in the experimental setup.
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05/11/2020 5:07 pm
(a) (i) Painting (ii) Galvanisation
(b) (i) Cinnabar (ii) Zinc Blende
(c) Impure copper is taken as anode whereas pure copper is taken as cathode. Copper sulphate solution (CuSO4) is taken as electrolyte. When electric current is passed, impure copper changes to ions which gain electrons at cathode and change into pure copper. Impurities are left behind as anode mud.
At anode: Cu(s) → Cu2+(aq) + 2e-
At Cathode: Cu2+(aq) + 2e- → Cu(s) Pure