`{:("LIST - 1","LIST-2"),("[Colloidal solution]","[Example]"),("A) Liquid in gas","1) Milk"),("B) Solid in gas","2) Boot polish"),("C) Liquid in liquid","3) Smoke"),("D) Solid in liquid","4) Cloud"),(,"5) Gold sol"):}`

Options

A. `{:(A,B,C,D),(4,3,1,2):}`
B. `{:(A,B,C,D),(2,1,5,4):}`
C. `{:(A,B,C,D),(3,3,2,5):}`
D. `{:(A,B,C,D),(1,4,3,2):}`

Answer

To solve the problem, we need to match the types of colloidal solutions from List 1 with their corresponding examples from List 2. Let's analyze each type of colloidal solution and find the correct matches.

### Step-by-Step Solution:

1. **Identify the Types of Colloidal Solutions:**
- A) Liquid in gas
- B) Solid in gas
- C) Liquid in liquid
- D) Solid in liquid

2. **Identify the Examples:**
- 1) Milk
- 2) Boot polish
- 3) Smoke
- 4) Cloud
- 5) Gold sol

3. **Match Each Type with the Correct Example:**
- **A) Liquid in gas:**
- This type of colloid is typically represented by a cloud, which consists of tiny droplets of water suspended in air.
- **Match:** A → 4 (Cloud)

- **B) Solid in gas:**
- An example of this type is smoke, which consists of solid particles dispersed in air.
- **Match:** B → 3 (Smoke)

- **C) Liquid in liquid:**
- This is best represented by milk, which is an emulsion of fat globules in water.
- **Match:** C → 1 (Milk)

- **D) Solid in liquid:**
- Boot polish is a colloidal solution where solid pigments are dispersed in a liquid medium.
- **Match:** D → 2 (Boot polish)

4. **Final Matching:**
- A → 4 (Cloud)
- B → 3 (Smoke)
- C → 1 (Milk)
- D → 2 (Boot polish)

### Summary of Matches:
- A) Liquid in gas → 4) Cloud
- B) Solid in gas → 3) Smoke
- C) Liquid in liquid → 1) Milk
- D) Solid in liquid → 2) Boot polish

### Conclusion:
The correct set of combinations is:
- A - 4
- B - 3
- C - 1
- D - 2

Thus, the answer is the first option from the given alternatives.

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