A freshly prepared `Fe(OH)_(3)` precipitate is peptized by adding `FeCl_(3)` solution. The charge on the colloidal particle is due to preferential adsorption of
Arsenous sulphide sol is prepared by passing H_2S through asenous oxide solution the charge developed on the particles is due to adsorption of
On adding FeCl_(3) solution to acidified Lassaigne's solution, a blood red colour is produced, it indicates the presence of
A solution of Cr(NO_3)_3 slowly turns green when cone. HCl is added due to the formation of
Acidified K_2Cr_2O_7 solution turns green when Na_2SO_3 is added to it. This is due to the formation of
On adding AgNO_(3) solution to KI solution, a negatively charged colloidal sol will be formed in which of the following conditions ?
An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCI in cold conditions. B is soluble in boiling water. An aqueous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with dilute H_(2)SO_(4) boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) Concentrated H_(2)SO_(4) is added to the resulting solution (along the walls of the test tube so that the H_(2)SO_(4) forms a separate layer). A brown ring is formed at the junction of the two layers. On treatment with a Kl solution, an aqueous solution of A will give
A colloidal sol Fe(OH)_(3) in water is
When freshly precipitated Fe(OH)_3 is boiled with water in the presence of few drops of dil HCl, a hydrated ferric oxide sol is obtained. This method is termed
NARENDRA AWASTHI-SURFACE CHEMISTRY-Level 3 - Assertion - Reason Type Questions
