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4) a (i) silver is better conductor of electric current because it has low resistivity compare to copper therefore, it allow more to pass electricity.
(ii) copper , because it has low resistivity and it can carry current over long distance.
b) Iron will give displacement reaction with copper sulphate solution because iron is more reactive than copper.
C) Nichrome because it is alloy and it does not melt even at high temperature.
d) cupper.
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