Adding alum to turbid water, impurties are removed due to -
Turbid waters, containing colloidal particles, are normally treated by coagulation-flocculation followed by clarification. Generally, alum is the first coagulant of choice because of its lower cost and its widespread availability. The coagulation performance of Alum, an inorganic chemical coagulant was tested on synthetic high turbid water.
Results showed that coagulation process could remove turbidity effectively using relatively low levels of Alum.
Which one of the following characteristics is not correct for physical adsorption ?
The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solution VS, could be –
For a true solution, the diameter range is 1 to < 10 Angstrom, and for colloidal solution,diameter range is 10-1000 Angstrom.
The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively. Which of the following statements is not correct?
In Langmuir's model of adsorption of a gas on a solid surface –
Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is
Which of the following statements is incorrect regarding physissorptions ?
The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order:
[IIT Mains 2013]