The index for the Gold number is:
1. Protective power of lyophilic colloid.
2. Purity of gold.
3. Metallic gold.
4. Electroplated gold.
Silver iodide is used for producing artificial rain because AgI is:
1. Easy to spray at high altitudes.
2. Easy to synthesize.
3. Having crystal structure similar to ice.
4. Insoluble in water.
The active species in Zeigler-Natta polymerisation of ethylene is:
1. AlCl3
2. Et3Al
3. H2C=CH2
4. Ti+3
A small amount of phosphoric acid can be used to prevent H2O2 decomposition. This an example of?
1. Neutralization
2. Negative catalysis
3. Positive catalysis
4. Catalytic poisoning
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.