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 the 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)

Copper(Cu) is a chemical element with atomic number 29. It can be classified as a native metal which 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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