Chemistry of Metals and Alloys

Ans : 3.

Oxygen as a gas is highly compressible in nature. 

Au is the symbol of gold, which is a metal.

The purest form of iron is wrought iron.

Copper is a metal.

This is the correct answer, as all the statements are correct.

Copper, lead, zinc, tin, aluminium are all non ferrous metals.

Bronze is primarily an alloy of copper and tin, typically containing about 88% copper and 12% tin. The combination of copper with tin creates a metal that is harder and more durable than copper alone. Bronze was one of the first alloys developed by humans, giving its name to the Bronze Age.

Solder wire is an alloy of tin and lead (or tin with other metals like silver, copper, antimony in lead-free solder). It does not contain copper. The other three alloys - phosphor bronze (Cu + Sn + P), german silver (Cu + Ni + Zn), and gun metal (Cu + Sn + Zn) all contain copper.

Aluminium is the most abundant metal in Earth's crust, constituting about 8% of the crust's total weight. It's a lightweight, silvery-white metal with excellent corrosion resistance. Aluminium is never found in pure form in nature but exists in compounds like bauxite ore, which is the primary source for commercial aluminium extraction.

Silicon carbide (SiC), also known as carborundum, is a compound of silicon and carbon with chemical formula SiC. It occurs in nature as the extremely rare mineral moissanite. SiC is widely used in high-temperature/high-voltage semiconductor electronics.

Zinc, also referred to in non-scientific contexts as spelter, is a bluish-white, lustrous, diamagnetic metal though most common commercial grades of the metal have a dull finish. It is somewhat less dense than iron and has a hexagonal crystal structure.

Iron is a metal in the first transition series. It is the most common element in the whole planet Earth, forming much of the earth's outer and inner core, and it is the fourth most common element in the earth's crust. It is ferromagnetic around room temperature.

Tungsten is used as the filament in incandescent bulbs because it has an extremely high melting point (3,422°C) and resists vaporization at the high temperatures needed to produce visible light. Other metals like iron, nickel, or copper would melt or evaporate too quickly at these operating temperatures.

Ag is the chemical symbol for silver, derived from the Latin word 'argentum'. Gold is Au, platinum is Pt, and lead is Pb.