Question

A shiny brown coloured element X on heating in air becomes black in colour. Name the element X and the black coloured compound formed.

Answer 1

Hint: Copper has the symbol Cu and atomic number 29 as a chemical element. This flexible, mixable and ductile metal is having both thermal and electrical conductivity. The pinkish-orange colour is a recently discovered colour of pure copper surface.

Complete step by step solution:

Copper is used as a heat and electric conductor as a construction medium for a number of metal alloys, such as sterling silver used to produce marine equipment as coins and continuously used for the calculation of temperature in pressure gauges and thermocouples.
The X must be copper since copper is a light brown, coloured product that produces black copper oxide whenever reacted with air with oxygen in it.
$\Rightarrow 2Cu + {O_2} \longrightarrow 2CuO$
Copper is generated commercially mainly by smelting or leaching, typically accompanied by sulphate solutions electrodeposition. The electrical industry utilizes the large portion of the copper produced in the world; much of the remaining metals are mixed into alloys. Rich groups of alloys with a main part are the brasses (copper and zinc), bronzes (copper and tin), and nickel silver (copper, zinc and nickel , silver not). (Technologically significant as electroplating).
The mechanical and electric properties of the solidified metal have a significant effect on the solubility of natural gases, such as oxygen , hydrogen, ozone and sulphur ozone, in copper form.

Hint: Copper, commonly used in buildings to form a green Verdigris (or patina), oxidizes in houses. In the practice of decoration. copper is often found both in elementary metal and pigment types in compounds. Copper compounds may be used as bacteriostatic agents, fungicides and wood-conserving chemicals.