Discussion
Among the following substances, which is commonly used for cloud seeding :
Answer: A
The substance commonly used is Silver Iodide.
Cloud seeding supplies nuclei on which supercooled droplets can freeze. Silver iodide has a crystal structure very close to that of ice, so it acts as an efficient ice nucleus at temperatures of only a few degrees below freezing. Dry ice and hygroscopic salts such as sodium chloride are also used.
Sand is not an effective nucleus. Black carbon is a pollutant from incomplete combustion, and copper sulphate is not used for seeding clouds.
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