Detailed Explanation:

Correct Answer: ✅ Option 1 (Silver iodide and Potassium iodide)

Artificial rainfall, also known as cloud seeding, is a weather modification technique used to induce precipitation. It is sometimes employed to reduce severe air pollution by washing pollutants and particulate matter out of the atmosphere.

✅ Option A is Correct: Silver iodide (AgI) and Potassium iodide (KI) are commonly used cloud-seeding agents. Their crystal structure resembles ice, helping water droplets condense and form rain.

❌ Option B is Incorrect: Silver nitrate is not a standard cloud-seeding material.

❌ Option C is Incorrect: Potassium nitrate is not used for inducing rainfall through cloud seeding.

❌ Option D is Incorrect: Neither silver nitrate nor potassium chloride is used as a conventional cloud-seeding agent.

Short Notes: Cloud Seeding

• Cloud seeding is an artificial technique used to enhance rainfall.

• Common seeding agents include silver iodide (AgI), potassium iodide (KI), and dry ice (solid CO₂).

• These substances act as condensation or ice nuclei.

• Cloud seeding is used to reduce air pollution, increase water availability, and mitigate drought.

• It works only when suitable clouds are already present.

• The technique cannot create clouds from a clear sky.

• Several countries, including India, China, UAE, and the USA, have experimented with cloud seeding.