What happens to the resistance of all pure metals on raising the temperature?

Correct option is C

The correct answer is (c) Increases.
· As the temperature of pure metals increases, the resistance of the metal also increases. This is because, at higher temperatures, the atoms in the metal lattice vibrate more vigorously, which causes more collisions between the free electrons and the vibrating atoms. These increased collisions impede the flow of electrons, thereby increasing the resistance.
Explanation of Other Options:
· Decreases: This is not true for pure metals; however, some materials like semiconductors and insulators exhibit a decrease in resistance with an increase in temperature.
· Remains unaffected: The resistance of pure metals does not remain unaffected by changes in temperature.
· Becomes negligible: The resistance of metals does not become negligible with an increase in temperature; instead, it increases.