The index for the Gold number is:
1. Protective power of lyophilic colloid.
2. Purity of gold.
3. Metallic gold.
4. Electroplated gold.
Milk contains a protein that is very good for health. The protein is:
1. caffeine
2. calciferol
3. keratin
4. casein
When sulphur sol is evaporated solid sulphur is left. On mixing with water no colloidal sol is formed. Sulphur sol is:
1. hydrophilic
2. hydrophobic
3. reversible
4. lyophilic
Lyophobic colloids are:
1. Reversible colloids
2. Irreversible colloids
3. Protective colloids
4. Gum, and proteins