What is meant by coagulation of a colloidal solution ?Describe briefly any three methods by which coagulation of iyophobic sols can be carried out.

What are the methods of coagulation of lyophobic sols?

What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amount of electrolytes ?

Which of the following electrolyte is most effective in coagulation of a negatively charged colloidal solution?

Explain Electrolytes can cause coagulation as well as peptisation of colloidal solution.

There are n+r points on a plane out of which n points lie on a straight line L and out of the remaining r points that lie outside L, no three points are collinear. What is the number of straight lines that can be formed by joining pairs of there points ?

Fill in the blanks : The minimum milligrams of a protective colloid to be added to 10 ml of standard red gold sol, so that no coagulation takes place when 1 ml of 10% NaCl solution is added is called ………….

On addition of 1 mL solution of 10% NaCl to 10 mL gold sol in the presence of 0.0250 g of starch, the coagulation is just prevented. What is the gold number of starch?

Out of KNO_3 and Al(NO_3)_3 which ore is required in minimum concentration for coagulation of As_2 S_3 sol ?