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) milk","(P) Aerosol "),("(B) Dust",(Q) " Emuslion"),("(C) Cheese","(R) Gel "),("(D)Froth ","(S) from "):}`

Answer

To solve the matching problem between Column - I and Column - II, we need to identify the type of colloidal solution represented by each item in Column - I and match it with the appropriate entries in Column - II.

### Step-by-Step Solution:

1. **Identify the first entry from Column - I: Milk**
- Milk is a colloidal solution where fat droplets are dispersed in water. It is classified as an emulsion.
- **Match:** (A) Milk → (Q) Emulsion

2. **Identify the second entry from Column - I: Dust**
- Dust particles suspended in air represent a colloidal system where solid particles are dispersed in a gas. This is classified as an aerosol.
- **Match:** (B) Dust → (P) Aerosol

3. **Identify the third entry from Column - I: Cheese**
- Cheese is another example of an emulsion where fat is dispersed in a solid medium.
- **Match:** (C) Cheese → (Q) Emulsion

4. **Identify the fourth entry from Column - I: Froth**
- Froth is a colloidal system where gas bubbles are dispersed in a liquid, which is classified as foam.
- **Match:** (D) Froth → (S) Foam

### Final Matches:
- (A) Milk → (Q) Emulsion
- (B) Dust → (P) Aerosol
- (C) Cheese → (Q) Emulsion
- (D) Froth → (S) Foam

### Summary of Matches:
- (A) → (Q)
- (B) → (P)
- (C) → (Q)
- (D) → (S)