Chemisorption is:

(1)multimolecular in nature

(2)reversible

(3)often highly specific and directional

(4)not very specific

Medicines are more effective if they are used in:

(1) Colloidal state

(2) Solid state

(3) Solution state

(4) None of these

Which is not shown by sols?

(a)Adsorption

(b)Tyndall effect

(c)Flocculation

(d)Paramagnetism

Detergent action of synthetic detergents is due to their:

(1) Interfacial area

(2) High molar mass

(3) Ionisation

(4) Emulsifying properties

A negatively charged suspension of clay in water needs for precipitation the minimum amount of:

(a) aluminium chloride

(b)potassium sulphate

(c)sodium hydroxide

(d)hydrochloric acid

The arsenious sulphide sol has negative charge. The maximum coagulationg power for precipitating it is of :

(1) 0.1 N Zn(NO₃)₂

(2) 0.1 N Na₃PO₄

(3) 0.1 N ZnSO₂

(4) 0.1 N AlCl₃

An emulsifier is a substance which:

(1) Homogenesis the emulsion

(2) Stabliizes the emulsion

(3) Retards the dispersion of liquid in liquid

(4) Coagulates the emulsion

Flocculation value is expressed in terms of:

(a) millimole per litre

(b) mole per litre

(c) gram per litre

(d) mole per millilitre

Which is an emulsifier?

(1) Soap

(2) Oil

(3) NaCl

(4) Water

The capacity of an ion to coagulate a colloidal solution depends on:

(1) It's shape

(2) Amount of its charge

(3) The sign of charge

(4) Both amount and sign of the charge