Question

Among the following, the false statement is:
A. Latex is a colloidal solution of rubber particles which are positively charged.
B. Tyndall effect can be used to distinguish between a colloidal solution and a true solution.
C. It is possible to cause artificial rain by throwing electrified sand carrying opposite to the one on clouds from an aero plane.
D. Lyophilic sol can be coagulated by adding an electrolyte.

Answer 1

Colloidal solutions or colloidal suspensions are nothing much but just a mixture in which the substances are regularly suspended in a fluid. A colloid is a very tiny and small material that is spread out uniformly through another substance.

Complete Step by step solution: Latex is a milky fluid produced by certain plants. It mainly consists of a colloidal suspension of rubber globules in a watery liquid. Latex is a colloidal solution of rubber particles which are negatively charged. Hence we can say that this option is false. Tyndall Effect is showed to identify between true and colloidal solution because tyndall effect is not shown by a true solution because the size of the constituent particles is very small i.e. 1nm in size that’s why this phenomenon can easily be used to distinguish between a true solution and colloidal solution. Hence this statement is true. Generally rain occurs when two opposite charges collide with each other artificial rain occurs when charges opposite to clouds are inserted in the environment so we can say that the given statement is true. Charge present on the colloidal sols tells us about their stability. If by any chance we remove the charge present on the sol then the particles get closer to each other and they combine to form aggregates and precipitate under the action of gravity which is known by coagulation or precipitation. By adding an electrolyte the colloidal particles are forced to move towards the oppositely charged particles by which they get discharged and collected at the bottom.

Note: Colloids are very much stable in nature. The particles of the dispersed phase are in a state of continuous motion and remain suspended in the solution. Colloids consist of two phases named as the dispersed phase and dispersion medium so they can be known as heterogeneous in nature.