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

Answer: copper

The shiny brown coloured element is Copper metal. As copper is heated in the air, it reacts with oxygen in the air to form black coloured copper oxide.

2Cu(s) + O2(g) → 2CuO(s)


Copper(Cu) is a chemical element with atomic number 29. It can be classified as a native metal that can occur in nature in its pure form. Few properties of copper are tabulated below.

Atomic number 29
Melting point 1084.62°C, 1984.32°F, 1357.77 K
Boiling point 2560°C, 4640°F, 2833 K
Density 8.96
Relative atomic mass 63.546

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