Chemistry of Metals and Alloys

Oxygen is the most abundant element in the Earth's crust, followed by Silicon and then Aluminium. However, among the provided choices, Aluminium is the most abundant metal.

The people of the Indus Valley Civilization were aware of copper, bronze, gold, and silver, but iron was not known to them.

German Silver is a misnomer, as it contains no silver. It is an alloy composed of copper, zinc, and nickel, valued for its silvery appearance and corrosion resistance.

Bronze is an alloy consisting primarily of copper, usually with tin as the main additive element.

Magnesium is often referred to as the Chemical Sun because it burns with an intense, brilliant white light when ignited, similar to the brightness of the sun. Other metals listed do not share this specific characteristic.

Copper is historically recognized as the first metal used by humans, marking the beginning of the Copper Age. It was relatively easy to extract and shape compared to other metals.

Lithium is the lightest metal and the lightest solid element. It has a very low density, allowing it to float on water.

Mercury is the only metal that is liquid at standard temperature and pressure. It has a unique atomic structure that prevents it from forming a solid lattice at room temperature.

Invar is an alloy primarily composed of iron and nickel, known for its uniquely low coefficient of thermal expansion.

A compound is a pure substance made up of two or more elements combined in a definite proportion by mass, which could be split by suitable chemical methods.

This is the correct option because all the above metals are used to make the resistance wire of fuse.

This is the correct option. Nichrome is used to make the element of a heater.

This is the correct option. Tungsten is used to make the filament of an electric bulb.

Bromine is the only  nonmetallic liquid element. It is a heavy, mobile, reddish-brown liquid, volatilizing readily at room temperature to a red vapour with a strong disagreeable odour, resembling chlorine, and having a very irritating effect on the eyes and throat; it is readily soluble in water or carbon disulfide, forming a red solution, is less active than chlorine but more so than iodine; it unites readily with many elements and has a bleaching action; when spilled on the skin it produces painful sores. It presents a serious health hazard, and maximum safety precautions should be taken when handling it.

Sulphur is a chalcogen. Chalcogens are the elements in Group 16 of the periodic table, which includes oxygen (O), sulphur (S), selenium (Se), tellurium (Te), and polonium (Po). The term 'chalcogen' means 'ore former' in Greek.