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In each of the following pairs, which wi...

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.` 1`M` and `0.1M` propanioc acid solutions.

Text Solution

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`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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