Metals And Non Metals Test - 3

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.

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

Gold is soluble in aqua regia, which is a mixture formed by freshly mixing concentrated nitric acid and hydrochloric acid in the ratio 1 : 3.

Magnesium nitride can be produced by heating magnesium metal in a pure nitrogen atmosphere.

3Mg + N₂ → Mg₃N₂

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

Sodium metal liberates hydrogen from cold water.

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.

Coloured glass used for goggles is composed of transition metal oxides (ferrous oxide), and also trace amounts of dopant are added to impart colours.

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