(i) p-type semiconductor

(ii) n-type semiconductor

(iii) intrinsic semiconductor

(iv) insulator

Correct Answer: (ii) n-type semiconductor

Explanation: N-Type semiconductor is created by adding pentavalent impurities such as phosphorus (P), arsenic (As), antimony (Sb), or bismuth (Bi). This impurity that occurs later is called the donor because it is ready to supply a free electron to the semiconductor. This pentavalent impurity is an electron-rich impurity.