Hardy-Schulze rule states that:

(1) Non-electrolytes have better coagulating action on colloids than electrolytes.

(2) Sols are coagulated by effective ions whose charge is opposite to that of sol and the ions of higher charge are much more effective than the ions of lower charge.

(3) Charge of the ions has no effect on the coagulation of a sol.

(4) Sols are coagulated only by those ions whose charge is similar to that of the sol.

 

An example of intrinsic colloid is:

(a) As₂S₃ sol                         (b) Fe(OH)₃ sol

(c) egg albumin                      (d) Au sol

Bleeding is stoped by the application of ferric chloride. This is because :

(1) The blood starts flowing in the opposite direction.

(2) The blood reacts and a solid is formed which seals the blood vessel.

(3) The blood is coagulated and the blood vessel are sealed.

(4) The ferric chloride seals the blood vessel.

Which is not a colloid?

(a) Chlorophyll                                   (b) Egg white

(c) Ruby glass                                    (d) Milk

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