Match the items given in Column I and Column II.
| Column I | Column II |
| A. Protective colloid | 1. FeCl3 + NaOH |
| B. Liquid-liquid colloid | 2. Lyophilic colloids |
| C. Positively charged colloid | 3. Emulsion |
| D. Negatively charged colloid | 4. FeCl3 + hot water |
Codes
| A | B | C | D | |
| 1. | 3 | 2 | 4 | 1 |
| 2. | 1 | 4 | 3 | 2 |
| 3. | 2 | 3 | 4 | 1 |
| 4. | 4 | 1 | 3 | 2 |
Hint: When ferric chloride is added to NaOH solution a negatively charged sol is obtained with adsorption of OH- ions.
The protective colloid is a type of lyophilic (water-loving) colloid that is used to protect the lyophobic colloids from precipitating in an electrolytic solution.
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable) owing to liquid-liquid phase separation.
If FeCl3 is added to the excess of hot water, a positively charged sol of hydrated ferric oxide is formed due to the adsorption of Fe3+ ions.
When ferric chloride is added to NaOH solution a negatively charged sol is obtained with adsorption of OH- ions.
hence, option third is the correct answer.
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