Which of the following is a semiconductor?

Options

A. C
B. Pb
C. Ge
D. Sn

Explanation

To determine which of the given options is a semiconductor, we can follow these steps:

### Step 1: Understand the Definition of a Semiconductor
Semiconductors are materials that have electrical conductivity between that of conductors (like metals) and non-conductors (like insulators). They are typically characterized by their ability to conduct electricity under certain conditions, such as the presence of impurities or changes in temperature.

**Hint:** Remember that semiconductors are not purely conductive or non-conductive; they fall in between.

### Step 2: Analyze Each Option
We will evaluate each option provided to identify if it is a semiconductor.

- **Option A: Carbon**
- Carbon is primarily known as a nonmetal. While certain forms of carbon (like graphite) can conduct electricity, it is not classified as a semiconductor in the traditional sense.

**Hint:** Check the classification of elements; carbon is a nonmetal.

- **Option B: Lead (Pb)**
- Lead is a metal and is known for its conductivity. However, it does not fall under the category of semiconductors.

**Hint:** Metals are generally good conductors, not semiconductors.

- **Option C: Germanium (Ge)**
- Germanium is a well-known semiconductor. It has properties that allow it to conduct electricity under certain conditions, making it suitable for use in electronic devices.

**Hint:** Look for elements that are known for their semiconductor properties.

- **Option D: Acetylene**
- Acetylene is a hydrocarbon and is not a metal or a semiconductor. It is a gas at room temperature and does not conduct electricity in the way semiconductors do.

**Hint:** Consider the state and properties of the compound; acetylene is not a solid element.

### Step 3: Conclusion
Based on the analysis of each option, the only semiconductor among the choices provided is **Option C: Germanium**.

**Final Answer:** The semiconductor from the options given is **Germanium (Ge)**.