Which ion is adsorbed when a diluted aqueous solution of AgNO3 (excess) is added to KI solution, resulting in formation of positively charged sol particles of AgI?
1. K+
2. Ag+
3. I-
4. NO3-
What is the simultaneous outcome of internal liquid from gels called?
1. Synerisis
2. Thixotropy
3. Swelling
4. None of the above
The charge on As2S3 sol is caused by the adsorption of:
1. H+
2. OH-
3.
4. S2-
Given below are three process:
a. Emulsification
b. Adsorption
c. Absorption
The process of froth flotation and chromatography is based on:
1. a & b
2. b & c
3. a & c
4. None of the above
Cloud bursts are caused by?
1. | Attraction towards the electrical charges on the earth. |
2. | Large amount of water present in the cloud. |
3. | Dense clouds are present in the upper atmosphere. |
4. | Mutual discharge of oppositely charged clouds resulting in the coagulation. |
Peptization is the process of?
1. Precipitating colloidal particles.
2. Purifying colloidal particles.
3. Dispersing the precipitate into a colloidal state.
4. None of the above.
Which is the electrolyte that is least effective in causing coagulation of +ve ferric hydroxide sol?
1. KBr
2. K2SO4
3. K2CrO4
4. K3[Fe(CN)6]
In adding 1 mL of solution of 10 % NaCl to 10 mL of gold solution in the presence of 0.25 g of starch, the coagulation is just prevented. Starch has a gold number equal to:
1. 0.25
2. 2.5
3. 250
4. 0.025
What is a solution that isn't a lyophilic colloid?
1. Milk
2. Gum
3. Fog
4. Blood
The surface tension of lyophilic sols is:
1. Lower than H2O
2. More than H2O
3. Equal to H2O
4. None of the above.