Milk can be preserved by adding a few drops of?

1. Formic acid solution             

2. Formaldehyde solution

3. Acetic acid solution             

4. Acetaldehyde solution

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. ${\mathrm{O}}_2^{-}$                             

4. S^2-

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?