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The arsenious sulphide sol has negative charge. The maximum coagulationg power for precipitating it is of :
(d) More is the valence of effective ion, greater is its coagulating power. The Hardy-Schulze rule.
An emulsifier is a substance which:
(b) Emulsifiers or emulsifying agent or emulgents are third component used to stablize a liquid-liquid sol,i.e., emulsion.
Colloidal solution commonly used in treatment of skin diseases is:
(a) Because of larger surface area in colloidal state, adsorption is more, also it acts as germ killer.
Adsorption is accompanied by:
(d) During adosrption, entropy decreases (disorder decreases or s = -ve). Also adsorption is always exothermic, ie., H decreases.
Flocculation value is expressed in terms of:
(a) Flocculation value or coagulation value is the amount of electrolyte in millimole to coagulate one litre as a colloidal solution.
A liquid which makes scatters a beam of light (visible in dark room) but leaves no residue when passed through a filtre paper is best described as:
(b) Sols or colloidal solutions scatter light and are passed through ordinary filtre paper.
Which is an emulsifier?
(a) Soaps, surfactants, polymer and finely divided metal oxides and hydroxides are emulsifiers.
KClO3 on heating decomposes into KCl and O2. If some MnO2 is added the reaction goes much faster because:
(d) MnO2 speeds up the reaction.
The capacity of an ion to coagulate a colloidal solution depends on:
(d) Follow Hardy-Schulze rule.
The blue colour of the water of the sea is due to :
(c) The scattering . Thus, scattering of blue light (shorter wavelength) is more.
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