Correct Answer: Sodium Nitrate

Solution : The correct option is Sodium Nitrate .

Chile saltpetre is the common name for Sodium Nitrate, a naturally occurring mineral form of nitrate. It is also known by its chemical formula NaNO₃. Chile's saltpetre historically gained significance as a valuable source of nitrate, an essential ingredient for the production of fertilizers and explosives. The term "Chile" in the name reflects its historical association with natural deposits found in the arid regions of Chile, particularly in the Atacama Desert.