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Q.

The decrease in electrical conductivity of metals with increase in temperature is due to increase in

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a

The velocity of electrons

b

The number of metal atoms

c

The resistance of the metal

d

The number of electrons

answer is B.

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Detailed Solution

As the temperature increases the positive ions in the crystal vibrate more. More collisions occur between valence electrons and vibrate ions which hinders motion of free electrons

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The decrease in electrical conductivity of metals with increase in temperature is due to increase in