Consider the following method for ore concentration:
| S.No. | Method of ore extraction | Property Involved |
| 1. | Froth floatation | weight of the ore |
| 2. | Magnetic Separation | magnetic property |
| 3. | Leaching | wetting property |
| 4. | Levitation | gravity separation |
Which of the above pair is/are correctly matched?
1
one pair only
2
two pairs only
3
three pairs only
4
All the pairs