The coloured discharge tubes for advertisement mainly contains

Options

A. Xe
B. Ne
C. He
D. Ar

Answer

To solve the question regarding the colored discharge tubes used for advertisements, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which gas is primarily used in colored discharge tubes for advertisements.

2. **Identify the Options**: The options provided are:
- A) Xenon
- B) Neon
- C) Helium
- D) Argon

3. **Research the Properties of Each Gas**:
- **Xenon**: While it can produce a blue light when ionized, it is not commonly used for advertisements.
- **Neon**: Known for producing a bright orange-red glow when an electric current passes through it. It is widely used in neon signs and advertisements.
- **Helium**: Produces a pale yellow light and is not typically used for vibrant advertising displays.
- **Argon**: Can produce a blue light but is also not as popular for advertising as neon.

4. **Determine the Most Common Gas Used**: Based on the properties of the gases, neon is the most common gas used in colored discharge tubes for advertisements due to its bright orange color and visibility.

5. **Conclusion**: Therefore, the correct answer to the question is **B) Neon**.