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

Answer:

the element X is copper and black coloured compound is copper oxide

Answer 2

The element x is copper (Cu), and the black coloured compound X is copper (II) oxide (CuO).

• Copper (x) is a shiny brown coloured metal.

• Copper is reactive towards oxygen. On heating in air, it combines with the oxygen present in air to form a layer of black coloured compound on its shiny surface.

• This black coloured layer on the metal surface, represented as X in the question, is that of copper (II) oxide, formed by the oxidation of copper in air.

• The reaction can be represented as under :

2 Cu (brown) + O₂ + ∆  →  2 CuO (black)