Assertion :Electrical conductivity of copper increases with increase in temperature. Reason: The electrical conductivity of metal is due to motion of electrons.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
The electrical conductivity of every metal decreases with an increase in temperature due to an increase in molecular motion which increases resistance.
So, the assertion is incorrect.

Electrical conductivity in metals is a result of the movement of electrically charged particles. Because valence electrons are free to move they can travel through the lattice causes the conduction of electricity.
Hence, the reason is correct.

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