Explain what is observed when :
(i) a beam of light is passed through colloidal sol
(ii) an electrolyte NaCa is added to ferric hydroxide sol
(iii) electric current is passed through a colloidal sol ?

Explanation

(i) For answer, consult Q. 15 (N.C.E.R.T Exercise)
(ii) For answer, consult Q. 15 (N.C.E.R.T Exercise)
(iii) For answer, consult Q. 15 (N.C.E.R.T Exercise)