Artificial way of causing rainfall to reduce air pollution makes use of [Miscellaneous]

The correct option is silver iodide and potassium iodide.

Artificial rainfall, also known as cloud seeding, is a weather modification technique used to induce precipitation. This process is particularly useful in reducing air pollution, as the falling rain helps wash down suspended particulate matter and pollutants from the atmosphere, a process known as wet deposition.

Cloud seeding works by introducing specific substances into clouds that act as cloud condensation nuclei or ice nuclei. These nuclei encourage water vapor to condense and freeze, forming ice crystals that eventually grow large enough to fall as rain.

The most common and effective chemical agents used for this purpose are:
1. Silver Iodide (AgI): Its crystalline structure is very similar to that of natural ice, making it an excellent ice-nucleating agent. It helps initiate the freezing process even at relatively high sub-zero temperatures.
2. Potassium Iodide (KI): This compound also serves as an effective seeding agent, often used to promote condensation and precipitation formation.
3. Dry Ice (solid carbon dioxide): Used to cool the air locally and encourage spontaneous ice crystal formation.

Among the given choices, the combination of silver iodide and potassium iodide represents the correct chemicals used in artificial rainmaking to combat air pollution.