Question

A shiny brown coloured element 'x'on heating in air becomes black in colour Name the element 'x' and the black coloured formed​

Answer 1

A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' and the black coloured compound formed. The shinny brown colored element 'X' is copper. When it is heated in air, it becomes black due to the deposit of copper oxide.

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Answer 2

i think it is iron as iron contact with air it looses its luster . l am not sure