Which does not show Tyndall effect?
(d) sugar solution does not shows Tyndall effect. Rest all the options shows this effect.
Butter is a colloid form in which:
(a) fat is dispersed in solid casein
(b) fat globules are dispersed in water
(c) water is dispersed in fat
(d) suspension of casein is in water
(c) Butter is an w/o emulsion having fat dispersed in water.
The cotterells precipitator is used to :
(a) neutralize charge on carbon particles in air in smoke
(b) coagulate carbon atoms of smoke
(c) bring in cataphoresis in carbon particles
(d) all of the above
(d) The negatively charged carbon particles in air (smoke) are moved towards anode due to cataphoresis, where they are neutralized to left free air. The process is used to control air pollution.
Foam is a colloidal solution of:
(a) gaseous particles dispersed in gas (c) solid particles dispersed in a liquid
(b) gaseous particles dispersed in a liquid (d) solid particles dispersed in gas
(b) Foam is a colloidal state of gas dispersed in liquid (froths) or in solid, i.e., solid foam (mattresses).
A liquid aerosol is a colloidal system of:
(a)a liquid dispersed in a solid
(b)a liquid dispersed in a gas
(c)a gas dispersed in a liquid
(d) a solid dispersed in a gas
(b) Liquid aerosol involves liquid dispersed in gas, e.g., cloud, fog , mist, etc.
Alum helps in purifying water by:
(a) forming Si complex with clay particles
(b) sulphate part which combines with the dirt and removes it
(c) aluminium which coagulates the mud particles
(d) making mud water soluble
(c) Al3+ is very good coagulating agent for -ve sol (muddy water).
Clouds, mist, fog and aerosols are colloidal solution of:
(a) solid in a gas
(b) gas in a solid
(c) liquid in a gas
(d) gas in a liquid
(c) All these are liquid aerosols systems, i.e., liquid dispersed in gas.
Gold number is the index for:
(a)protective power of lyophilic colloid
(b)purity of gold
(a) it is a scale to represent protective power of lyophilic sols.
Egg albumin is:
(d)all of these
(d) egg albumin is organic sols and organic sols are usually lyophilic.
Milk contains a protein that is very good for health. The protein is:
(d) Casein is the omportant protein of milk.