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In each of the following pairs, which will conuct more electricity? `a.` `Cu` wire at `30^(@)C` and `60^(@)C`. `b.` `KBr` solution at `30^(@)C` and `60^(@)C`. `c.` `NH_(4)OH` solution at `30^(@)C` and `60^(@)C`. `d.` `M` and `0.1M` propanioc acid solutions. |
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Answer» `a.` `Cu` wire at `30^(@)C` will conduct more electricity since conductance in metals is inversely proportional to temperatue. With the increase in temperature, metallic conductance decrease due to the vibration of positive fixed kernals. `b.` `KBr` solution at `60^(@)C` , because conductance of a strong electrolyte is directly proportional to the temperature due to the increase in ionic mobilities. `c.` `NH_(4)OH` solution at `60^(@)C`, because the conductance of a weak electrolyte is also direactly proportional to temperature due to increase in ionization. `d.` `0.1M` propanoic acid solution , because the conductance of a weak electrolytic is inversely proportional to concentration or directly proportional to dilution due to increase in ionization on dilution. |
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