Discussion
Which of the following chemicals is used in cloud seeding to enhance rainfall ?
Answer: A
The chemical is Silver iodide.
Silver iodide has a crystal structure very close to that of ice, so its particles act as nuclei on which supercooled water droplets in a cloud freeze into ice crystals. The crystals grow and fall, melting into rain on the way down. It is dispersed from aircraft or ground generators; dry ice and common salt are also used for seeding.
Magnesium nitrate and potassium permanganate have no such role, and diphenyl carbazide is a laboratory reagent used to detect chromium.
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