Brownian movement was discovered by:
Which one of the following statements is correct :
i) Brownian movement is more pronounced for smaller particles than for bigger ones
ii) Sols of metal sulphides are lyophilic
iii) Schulze-Hardey law states, the bigger the size of the ion, the greater is its coagulating power
iv) One would be expect charcoal to adsorb chlorine more strongly hydrogen sulphide