Chalcopyrite (CuFeS2) is the most abundant and economically significant copper-bearing mineral. Siderite is an iron ore, bauxite is the primary ore of aluminum, and dolomite is a carbonate mineral containing calcium and magnesium.

Silver (Ag) is a noble metal with a low reactivity, meaning it does not easily react with oxygen or other elements in the environment. Consequently, it is frequently found in nature in its elemental, uncombined form. In contrast, metals like sodium, calcium, and aluminum are highly reactive and are almost exclusively found as compounds, such as oxides, chlorides, or carbonates, requiring chemical reduction for extraction.

German silver, also known as nickel silver, is an alloy composed primarily of copper, nickel, and zinc. Despite its name, it contains no actual silver. Copper is the major component, typically making up about 50-60% of the alloy's composition.

Bauxite is a sedimentary rock with a high aluminium content. It is the world's main source of aluminium and gallium. The ore is processed through the Bayer process to produce alumina, which is then smelted to extract pure aluminium metal.

Polling is a metallurgical process used to remove impurities from molten metals, particularly metal oxides. It involves stirring the molten metal with green wooden poles; the hydrocarbons released from the wood reduce the metal oxides back to the pure metal state. This is historically significant in copper refining.

Brass is a well-known binary alloy consisting primarily of copper and zinc. The proportions of these two metals can be varied to achieve different mechanical and electrical properties. In contrast, bronze is primarily an alloy of copper and tin.

Laminated glass, often reinforced with polycarbonate layers, is used in bullet-resistant applications. While modern soft body armor typically uses high-strength synthetic fibers like Kevlar, the term 'laminated glass' is historically associated with bullet-resistant panels used in security glazing and protective shields. Note: This question may be context-dependent regarding modern ballistic materials versus traditional security glass.

Iron impurities in raw materials often impart a greenish color to glass. Manganese dioxide acts as a decolorizing agent by oxidizing the iron from the ferrous state (which is green) to the ferric state (which is less intensely colored), effectively neutralizing the tint.

Statement 1 is technically imprecise as 'anhydrous' sodium bicarbonate is not the standard form used in baking; it is usually the hydrated salt. However, in many contexts, it is accepted. Statement 2 is correct as it releases CO2 upon heating. Statement 3 is correct as the Hasenclever process is a historical method for manufacturing bleaching powder.

Gunpowder, also known as black powder, is a traditional explosive mixture consisting of three main ingredients: potassium nitrate (nitre), which acts as the oxidizer; charcoal, which serves as the fuel; and sulphur, which lowers the ignition temperature and increases the speed of combustion. When ignited, these components react rapidly to produce a large volume of hot gases, creating an explosive effect.