Question

Assertion : Boron has low electrical conductivity

Reason : At ordinary temperature born behave as metallic​

Answer 1

The complete question is:-

Assertion (A): Boron has low electrical conductivity  

Reason (R): At ordinary temperature born behave as metallic​

(a) Both A and R are true and R is the correct explanation of A.  

(b) Both A and R are true but R is not the correct explanation of A.  

(c) A is true but R is false.  

(d) A is false but R is true.

Answer:-

Assertion is true but the reason is false. (option c)

• Boron is the first member of the Group-13.
• It is a semiconductor by nature. In other words, it behaves as a metal at high temperatures by conducting electricity.
• This is because, at high temperatures, the electrons can move from the valence band to the conduction band.
• At lower temperatures, it almost acts as an insulator.
• Thus, the assertion is true but the reason is false.