Explain what is observed when an electrolyte (say NaCl) is added to ferric hydroxide sol.

Explain what is observed :- an electrolyte, NaCl is added to hydrated ferric oxide sol.

Explain what is observed :- when a beam of light is passed through a colloidal sol.

Explain what is observed when abeam of light is passed through colloidal solution of arsenious sulphide? Give the name of the phenomenon also.

State what is observed when iodine is heated in a test tube

Explain what is observed :- electric current is passed through a colloidal sol?

what is the correct sequence of the decreasing coagultion value of the following electrolyte for the coagultion of ferric hydroxide sol ? (I) Na_(3) PO_(4) (II)KCl (III) K_(2)SO_(4) (IV)K_(4)[Fe(CN)_(6)]

Explain what happens when borax is heated ?

What is observed when a solutin of potassium iodide is added to a solution of lead nitrate taken in a test tube?

What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?

Read the given passage and answers following questions : The particles of colloidal solution possess electrical charge which is responsible for the stability of these solutions. The charge on colloidal particles arises because of selective adsorption of ions which are common with their own lattice. The presence of charge on colloidal particles can be determined with the help of phenomenon known as electrophoresis. However, when some electrolyte is added, the charge on the particles of, dispersed phase gets neutralized and precipitation takes place. This process is also called coagulation. The coagulation is given by Hardy Schulze rules. According to these rules the ions carrying the charge opposite to that of sol particles are effective and coagulating power of an electrolyte is directly proportional to the fourth power of the valency of the ion. Coagulation can also occur by mutual precipitation , by electrophoresis, by persistent dialysis or by heating or cooling. Answer the following questions : What happens to the charge of particles when electrolyte is added ?