Question

A shiny brown coloured element "X" on heating in air become black in colour . Name the element 'x' and black coloured compound Y formed .how can you get back X from Y. Describe various step for extraction of X from its ores. Write the balanced chemical equation involved in the process.

Answer 1

The black colour element is "copper" and the compound hence formed is "CuO" or "copperoxide".The balanced equation is:
2Cu + O2 -----------> 2CuO