Match the Column - I with the Column - II.
| Column - I | Column - II |
| a. Iron | 1. Colloid |
| b. Urea | 2. Element |
| c. Air | 3. Compound |
| d. Coloured gemstone | 4. Mixture |
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Match the Column - I with the Column - II.
| Column - I | Column - II |
| a. Iron | 1. Colloid |
| b. Urea | 2. Element |
| c. Air | 3. Compound |
| d. Coloured gemstone | 4. Mixture |