How many of the following statements are correct?
(a) Delta at the mouth of a river is formed due to the coagulation of the colloidal sea water by the electrolytes present in the river water.
(b) Artificial rain is caused by the coagulation of colloidal water droplets in the clouds by an electrolyte.
(c) Cotrell precipitator is used in the precipitation of the colloidal waste in the sewage water. 
(d) Cheese is an example of solid foam. 
(e) A colloid formed by adding small amount of ${\mathrm{AgNO}}_3$ to Kl solution is negatively charged. 
(f) Micelles are formed only below the Kraft temperature (Tk) 
(g) Mixing of hydrated ferric oxide sol and arsenious sulphide sol bring them in precipitated form. 
(h) An oil in water emulsion can be diluted by addition of water.
 (i) Emulsions show Brownian motion and Tyndall effect.