In case of a semi conductor, which one of the following statements is wrong?

Options

A. Resistivity is in between that of a conductor and insulator
B. Temperature coefficient of resistance is negative
C. Doping increases conductivity
D. At absolute zero it behaves as a conductor

Answer

To determine which statement about semiconductors is incorrect, we will analyze each option step by step.

### Step 1: Analyze the first statement
**Statement:** The resistivity is in between conductor and insulator.

- **Explanation:** Conductors have low resistivity, insulators have high resistivity, and semiconductors fall in between these two categories. This statement is correct.

### Step 2: Analyze the second statement
**Statement:** The temperature coefficient of resistance is negative.

- **Explanation:** In semiconductors, as the temperature increases, the number of charge carriers (electrons and holes) increases, leading to a decrease in resistivity. Therefore, the temperature coefficient of resistance for semiconductors is negative. This statement is correct.

### Step 3: Analyze the third statement
**Statement:** Doping increases conductivity.

- **Explanation:** Doping introduces additional charge carriers (either electrons or holes) into the semiconductor material, which increases its conductivity. This statement is correct.

### Step 4: Analyze the fourth statement
**Statement:** At absolute zero, it behaves as a conductor.

- **Explanation:** At absolute zero, all the electrons in a semiconductor are in the valence band, and there are no free charge carriers available for conduction. Therefore, it behaves like an insulator, not a conductor. This statement is incorrect.

### Conclusion
The wrong statement among the options provided is:
**Option D:** At absolute zero it behaves as a conductor.

### Final Answer
The correct answer is **Option D**.

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