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Question

Which is not true:
  1. Resistance of metals increases with increasing temperature
  2. Resistance of semi-conductors decreases with rise of temperature
  3. Resistance of an electrolyte increases with rise of temperature
  4. None of the above

A
Resistance of semi-conductors decreases with rise of temperature
B
Resistance of an electrolyte increases with rise of temperature
C
None of the above
D
Resistance of metals increases with increasing temperature
Solution
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(A) We know in metals the atoms are closely packed thus increasing temperature increases the energy of the molecules present in the metal, which leads to vigorous vibration of the molecules resulting in violent collision of the electrons with each other and hence increasing the resistance of the metal.
(B) When we increase temperature in semi-conductors the electrons in the valence gets excited and jumps into the conductance band thus increasing the conductance.As conductance increases,resistance decreases.
(C) Resistance offered in an electrolyte is due to the limited mobility of ions which,in an electrolyte current is carried by moving ions. And we know ion mobility increases with temperature,hence decreasing the resistance of electrolytes with increasing temperature.

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