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प्रश्न
How does it become possible to cause artificial rain by spraying silver iodide on the clouds?
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उत्तर
Clouds carry a charge as they are colloids. Silver iodide AgI being an electrolyte helps in coagulation process between colloidal particles of water in the cloud. Thus it forms bigger raindrops causing artificial rain. AgI is usually sprayed from an aeroplane or remote-controlled rockets.
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संबंधित प्रश्न
Define the following term:
Zeta potential
Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?
Give reasons for the following observations: Leather gets hardened after tanning.
Explain the term Electrophoresis
Explain the terms Coagulation
A colloidal sol is prepared by the given method in the figure. What is the charge on hydrated ferric oxide colloidal particles formed in the test tube? How is the sol represented?
What happens when a lyophilic sol is added to a lyophobic sol?
(i) Lyophobic sol is protected.
(ii) Lyophilic sol is protected.
(iii) Film of lyophilic sol is formed over lyophobic sol.
(iv) Film of lyophobic sol is formed over lyophilic sol.
Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?
(i) Reverse osmosis takes place.
(ii) Electroosmosis takes place.
(iii) Dispersion medium begins to move.
(iv) Dispersion medium becomes stationary.
Why do we add alum to purify water?
Assertion: Coagulation power of Al3+ is more than Na+.
Reason: Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy Schulze rule).
What is common in aqua sols and solid aerosols? How do they differ?
The important factor in the stabilization of a colloidal solution is ______
The right option for the statement “Tyndall effect is exhibited by”, is:
Define coagulation.
Which of the following is a correct statement?
Coagulation value of the electrolytes AlCl3 and NaCl for As2S3 sol are 0.093 and 52 respectively. The No. of times AlCl3 has greater coagulating power than NaCl is ______.
