When the conductivity of a semiconductor is only due to the breaking of the covalent bonds, the…
When the conductivity of a semiconductor is only due to the breaking of the covalent bonds, the semiconductor is called
donor
intrinsic
acceptor
extrinsic
Solution
At room temperature, in impure semiconductors some free charge carriers are available for conduction due to impurity atoms. But in pure, i.e., intrinsic semiconductors, $\mathrm{n}=\mathrm{p}$. Hence, at room temperature no free electrons are available for conduction. If the temperature is increased the covalent bonds will break and electrons will be freed, each electron will leave behind a hole and capture a new hole the process will continued and charge flows through intrinsic semiconductor. Thus, its conductivity is only due to breaking of covalent bonds.