General Knowledge

Rhodium is considered one of the rarest and most valuable precious metals on Earth, often found in small quantities in platinum or nickel ores.

Saltpetre is the common name for potassium nitrate (KNO3). It has historically been used in fertilizers, gunpowder, and food preservation.

Marble is a metamorphic rock composed primarily of calcium carbonate (CaCO3), which contains calcium, carbon, and oxygen. Therefore, all these elements are components of marble.

Polythene (polyethylene) is a polymer produced by the polymerization of ethylene monomers. The process links ethylene molecules together to form long chains.

Epsom salt is the common name for magnesium sulfate heptahydrate (MgSO4·7H2O). It is widely used for baths and as a fertilizer.

Vitamin C is chemically known as ascorbic acid. It is an essential nutrient involved in tissue repair and enzymatic functions.

Formic acid was first isolated in 1671 by the English naturalist John Ray, who distilled it from a large number of ants. The name comes from the Latin word for ant, formica.

Tear gas refers to various chemical compounds that cause severe eye and respiratory pain. Phenacyl chloride, sometimes referred to by older names like benzenyl chloride, is a common active ingredient in early tear gas formulations.

Oxygen is the oxidizing agent required for combustion (burning). Without oxygen, most fires cannot sustain themselves.

Plaster of Paris is a quick-setting gypsum plaster consisting of a fine white powder, calcium sulfate hemihydrate. It hardens when moistened and allowed to dry.

Australia is consistently one of the world's largest producers of bauxite, which is the primary ore used to produce aluminum.