(A): Neon is used to fill advertisement glass bulbs
(R): Neon gives coloured discharge at low pressure

Options

A. Both A & R are true, R is the correct explanation of A
B. Both A & R are true, R is not correct explanation of A
C. A is true, R is false
D. A is false, R is true

Answer

To analyze the assertion and reason provided in the question, we will break down the information step by step.

### Step 1: Understanding the Assertion
**Assertion (A):** Neon is used to fill advertisement glass bulbs.

- Neon is a noble gas that is commonly used in advertising signs, often referred to as neon lights. These lights are filled with neon gas, which emits a bright glow when an electric current passes through it.

### Step 2: Understanding the Reason
**Reason (R):** Neon gives colored discharge at low pressure.

- When neon gas is subjected to low pressure and an electric current, it ionizes and emits light. The characteristic color of neon discharge is a reddish-orange hue. This property is what makes neon suitable for use in advertisement signs, as it can produce bright and vibrant colors.

### Step 3: Evaluating the Relationship
- Both the assertion and the reason are true statements. Neon is indeed used in advertisement glass bulbs, and it does give a colored discharge when an electric current is applied at low pressure.

### Step 4: Conclusion
- Since both statements are true and the reason correctly explains why neon is used in advertisement bulbs, we can conclude that the assertion (A) and the reason (R) are both true, and R is the correct explanation of A.

### Final Answer:
Both the assertion and the reason are true, and the reason is the correct explanation for the assertion.

---