Which of the following substances has the lowest electric resistivity at room temperature?

Aluminium

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Iron

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Nichrome

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Diamond

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Solution

The correct option is A Aluminium
Resistivity is the reciprocal of conductivity
i.e. $ρ = \frac{1}{σ}$
Lowest Resistivity = Highest Conductivity
Hence aluminium has more conductance as it has 3 unpaired electrons in the excited state. Hence option A is the correct answer.

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