Advertisements
Advertisements
प्रश्न
How does it become possible to cause artificial rain by spraying silver iodide on the clouds?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
What is the reason for the stability of colloidal sols?
Define the following terms: Associated colloids
Give reasons for the following observations: Leather gets hardened after tanning.
What modification can you suggest in the Hardy-Schulze law?
Explain what is observed when a beam of light is passed through a colloidal sol.
Explain what is observed when an electric current is passed through a colloidal sol?
Explain the term Tyndall effect.
What happens when a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution?
Which of the following will show Tyndall effect?
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.
What causes brownian motion in colloidal dispersion?
Assertion: An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.
Reason: Pore size of the filter paper becomes more than the size of colloidal particle.
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 Gold number?
The important factor in the stabilization of a colloidal solution is ______
State the Hardy-Schulze rule.
What is electrophoresis?
Which of the following is a correct statement?
The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
- The diameter of the colloidal particles is comparable to the wavelength of light used.
- The diameter of the colloidal particles is much smaller than the wavelength of light used.
- The diameter of the colloidal particles is much larger than the wavelength of light used.
- The refractive indices of the dispersed phase and the dispersion medium are comparable.
- The dispersed phase has a very different refractive index from the dispersion medium.
Choose the most appropriate conditions from the options given below:
Lyophilic sols are more stable than lyophobic sols because ______.
