Among the following, the false statement is :
- (A)It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane.
- (B)Tyndall effect can be used to distinguish between a colloidal solution and a true solution.
- (C)Lyophilic sol can be coagulated by adding an electrolyte.✓ Correct
- (D)Latex is a colloidal solution of rubber particles which are positively charged.
Answer: (C)
Solution
Charged sand of opposite sign can neutralise a cloud's charge to bring on artificial rain, the Tyndall effect does separate a colloid from a true solution, and latex is indeed a positively charged colloidal dispersion of rubber. The claim that fails is that a lyophilic sol is coagulated by simply adding a little electrolyte lyophilic sols are heavily solvated and stable, needing large amounts of electrolyte, so that statement is false.
JEE Main · 2019 · 12 Jan 2019 · Shift 2 · Single correct option