The correct statements among the following are :
| a. | Mixing two oppositely charged sols neutralizes their charges and stabilizes the colloid. |
| b. | The presence of equal and similar charges on colloidal particles provides stability to the colloids. |
| c. | Any amount of dispersed liquid can be added to the emulsion without destabilizing it. |
| d. | Brownian movement stabilizes sols. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)
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