Surface Chemistry - Result Question 9
9. Among the following, the false statement is
(2019 Main, 12 Jan II)
(a) Tyndall effect can be used to distinguish between a colloidal solution and a true solution
(b) It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane
(c) Lyophilic sol can be coagulated by adding an electrolyte
(d) Latex is a colloidal solution of rubber particles which are positively charged
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Answer:
Correct Answer: 9. (d)
Solution:
Statement given as statement (d) is incorrect. Latex is a stable dispersion, i.e. emulsion of polymer microparticles in an aqueous medium.
These microparticles belong to rubber and are negatively charged in nature. Natural latex contains some amount of sugar, resin, protein and ash as well.
The closest synthetic latex that can be associated with the properties of natural latex is SBR, i.e. Styro Butane Rubber.
Rest of all the statements are correct.
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