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

Sulphuric acid is not prepared by dissolving SO_3 in water. Why?

Sulphuric acid can be manufactured from sulpihur using V_2O_5 as catalyst:- Give the name of the method.

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.

Sulphuric acid is formed also by the direct dissolution of sulphur trioxide in water. Still, sulphur trioxid is not directly dissolved in water. Why?

Classify dilute rice water, salt water, and muddy water samples into solution, colloid and suspension.

An inorganic compound on strong heating gave a blackish brown powder and two oxides of sulphur. The powder was dissolved in HC1 when a yellow solution was obtained which gave a blood red coloured solution with thiocyanide ions. The inorganic compound may be:

It is not advisable to pour water into sulphuric acid, while diluting sulphuric acid. Give reaction.