Purification of Colloidal Solution

Q. Colloidal sols can be purified by:

1. Dialysis
2. Ultra-filtration
3. Ultra-centrifugation
4. All of these

Q. Colloidal sols can be purified by:

1. Dialysis
2. Ultra-filtration
3. Ultra-centrifugation
4. All of these

Q. Which mixture of the solutions will lead to the formation of negatively charged colloidal $[AgI{]}^{-1}$ sol ?

1. $50mL$ of $1M$ $AgN{O}_3$ + $50mL$ of $0.5M$ $KI$
2. $50mL$ of $1M$ $AgN{O}_3$ + $50mL$ of $2M$ $KI$
3. $50mL$ of $2M$ $AgN{O}_3$ + $50mL$ of $1.5M$ $KI$
4. $50mL$ of $0.1M$ $AgN{O}_3$ + $50mL$ of $0.1M$ $KI$

Q. Tribhuvan Das is an ice-cream scientist and it is his job to make different yet delicious varieties of ice-creams. Before being frozen, ice cream mixtures are in the colloidal state. For months, Tribhuvan Das has been experimenting with new flavours but never got satisfactory results. On a Saturday night just before Diwali, he accidentally mixed up two different samples and got a delicious Sundae. Tribhuvan sent the sample to his boss for tasting, but the boss found it a bit saltier for his palate. It is Diwali time so Tribhuvan is away on leave. The boss is impatient and wants to taste the ice-cream but without the extra saltiness. What should he do?

1. Heat the mixture
2. Use a centrifuge
3. Dialysis
4. None of the above