Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II.
`{:("column-I","column-II"),("(A) Liquid dispersed in gas","(P) foam "),("(B) Gas dispersed in liquid ",(Q) " Emulsion"),("(C) Liquid dispersed in solid ","(R) Aerosol "),("(D) Liquid dispersed in liquid ","(S) Gel "):}`

Answer

To solve the matching question between Column - I and Column - II, we need to identify the type of colloidal systems represented in each entry of Column - I and match them with the correct descriptions in Column - II. Here's the step-by-step solution:

### Step-by-Step Solution:

1. **Identify the entries in Column - I:**
- (A) Liquid dispersed in gas
- (B) Gas dispersed in liquid
- (C) Liquid dispersed in solid
- (D) Liquid dispersed in liquid

2. **Identify the entries in Column - II:**
- (P) Foam
- (Q) Emulsion
- (R) Aerosol
- (S) Gel

3. **Match each entry from Column - I with Column - II:**
- **(A) Liquid dispersed in gas:**
- This describes an **Aerosol**. Aerosols consist of liquid droplets dispersed in a gas (e.g., mist or fog).
- **Match:** (A) → (R)

- **(B) Gas dispersed in liquid:**
- This describes a **Foam**. Foams are created when gas bubbles are dispersed in a liquid (e.g., whipped cream).
- **Match:** (B) → (P)

- **(C) Liquid dispersed in solid:**
- This describes a **Gel**. Gels consist of liquid dispersed in a solid matrix (e.g., jelly).
- **Match:** (C) → (S)

- **(D) Liquid dispersed in liquid:**
- This describes an **Emulsion**. Emulsions consist of one liquid dispersed in another liquid (e.g., milk).
- **Match:** (D) → (Q)

4. **Final Matching Results:**
- (A) → (R) (Aerosol)
- (B) → (P) (Foam)
- (C) → (S) (Gel)
- (D) → (Q) (Emulsion)

### Summary of Matches:
- (A) Liquid dispersed in gas → (R) Aerosol
- (B) Gas dispersed in liquid → (P) Foam
- (C) Liquid dispersed in solid → (S) Gel
- (D) Liquid dispersed in liquid → (Q) Emulsion