Which is the most common chemical used in cloud seeding?

Which is the most common chemical used in cloud seeding?
[A]Potassium bromide
[B]Silver iodide
[C]Potassium chloride
[D]Magnesium iodide

Silver iodide
The most common chemicals used for cloud seeding include silver iodide, potassium iodide and dry ice (solid carbon dioxide). Cloud seeding process involved a furnace in which coal is burnt at 1,350 degrees Celsius in which powdered Silver Iodide is sprinkled. These particles rise in the air to cloud level in 10-12 minutes. After these particles travel upwards, they crystallize at minus-five degrees and since clouds have both ice and water crystals, the particles attract the water, its weight increases and they fall down in the form of rain within a couple of hours.

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