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Assertion : Semiconductors are solids with conductivities in the intermediate range from 10^(-6) to 10^4 "ohm"^(-1)"m"^(-1). Reason: Intermediate conductivity in semi conductor is due to partially filled valence band.

Answer»

Assertion and REASON both are correct statement and reason is correct explanation for assertion. 
Assertion and reason both are correct statements but reason is not correct explanation for assertion. 
Assertion is correct statement but reason is WRONG statement. 
Assertion is wrong statement but reason is correct statement. 

SOLUTION :The CONDUCTIVITY in semiconductors is due to small energy gap i.e., forbidden gap.


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