Which of the following is not a semiconductor?

Which of the following is not a semiconductor? Correct Answer NaCl

Semiconductors are those materials that are neither good conductors nor the good insulators of heat and electricity. Silicon (Si), Germanium (Ge) and Cadmium Sulphide (CdS) are semiconductors which work as conductors in some special conditions only.

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নিম্নের কোনটি p-টাইপ অর্ধপরিবাহীতে n-টাইপ অর্ধপরিবাহীর তুলনায় বেশি আছে? (Which of the following does a p-type semiconductor have more compared to an n-type semiconductor-)  
A semiconductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semiconductor is made by doping germanium with indium (Z = 49). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct
Which of the following statements is correct about p-type semiconductor and n-type semiconductor?
Which type of impurity is to be added to a pure semiconductor to get an n-type semiconductor?
Which is the majority charge carrier in p-type semiconductor and n-type semiconductor?