Chemistry · Group 13 to Group 18 Elements
A shiny brown-coloured element 'X' on heating in air becomes black in colour Nam
A shiny brown-coloured element 'X' on heating in air becomes black in colour Name the element 'X'?
- A. Sodium
- B. Calcium
- C. copper
- D. Aluminium
Step-by-step solution
Copper is a shiny brown metal. When heated in air, it oxidizes to form black copper(II) oxide (CuO). Other options (sodium, calcium, aluminium) are silvery-white and form white oxides.
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