Colloidal solution of gold is prepared by striking an electric are between gold electrodes kept in water. What is this method called as? Why is it regarded as a dispersion method?

Raju and Ramu were asked to prepare a colloidal solution each. Raju added starch powder into water while Ramu added saturated FeCl_3 solution ito excess boiling water. What type of colloid did Raju and Ramu prepare?

Aluminium is reduced using electricity for its preparation. But gold which is seen in free form can be separated easily why?

Which of the,following statements is incorrect? Colloidal gold is used for intramuscular injection, Colloidal solution of latex is used in preparation of rubber, Colloidal solution of latex is used in preparation of rubber, Tannin used in leather industry contains positively charged colloidal particles

Ferric hydroxide sol can be prepared from freshly perpared ferric hydroxide precipitate. It can also be prepared by adding ferric chloride solution to boilling water. In both cases the sol particles are positively charged. Name the above two methods of preparation of ferric hydroxide sol.

Ferric hydroxide sol can be prepared from freshly prepared ferric hydroxide precipitate. It can also be prepared by adding ferric chloride solution to boiling water. In both cases the sol particles are positively charged. What happenswhen an electric pot ential is applied across two platinum electrodes dipping in" ferric hydroxide sol? Explain.

Colloids are an intermediate between suspension and solutions. Suggest suitable method for the preparation of the following sol:Gold sol

Name the method of formation of two roads of the gold metal are immersed in cold alkaline water and a direct electric are is struck.

Sulphur solIsformedby dissolving sulphur in alcohol and the solution is diluted with water. Name the method of formationin the above, describehow colloids are formed.

Select the correct statements. : Zeta potential is the potential needed for electrophoresis, During electrophoresis, colloidal particle in A s 2 S 3 solution move towards anode, During electroosmosis, dispersed phase move towards oppositely charged electrode on application of electric field, Tyndall effect can be shown by true solution