The lightest element in the periodic table is hydrogen.

The statement that all metal oxides are basic in nature is incorrect because oxides of some metals like zinc and aluminium are amphoteric in nature.

Copper will not liberate hydrogen gas on its treatment with dilute HCl because copper is less reactive than hydrogen and thus, it cannot replace hydrogen from hydrochloric acid.

The Government of India has totally banned the export of 'Burnt Coal' (Jhama) because it contains recoverable amount of germanium element, used in transistors.

The filament of an electric bulb is made of tungsten.

On increasing the temperature, the conduction in metallic conductors decreases.

Sodium metal liberates hydrogen from cold water.

The function of adding cryolite in the extraction of aluminium from pure alumina is to decrease the fusion temperature and increase the electrical conductivity.

Magnesium nitride can be produced by heating magnesium metal in a pure nitrogen atmosphere. 3Mg + N2 → Mg3N2

Coloured glass for goggles contains ferrous oxide.

Nitrogen gas can be prepared by heating a mixture of sodium nitrite and ammonium chloride.

Argentite is an ore of silver.

Gunpowder may be used as an explosive.

Gold is soluble in aqua regia, which is a mixture formed by freshly mixing concentrated nitric acid and hydrochloric acid.

The purest form of iron is wrought iron.

Amalgams are the alloys, which always contain mercury.

German silver is an alloy of copper, zinc and nickel.

Stainless steel usually contains about 15% of chromium.

The reference electrode is made from Hg₂CI₂.

The statement which differentiates metals from non-metals is that non-metals do not replace hydrogen from acids, but metals can do.