Question

A brown substance 'x' on heating in air forms a compound 'y'. When hydrogen gas is passed over 'y', it changes to 'x' again. I. Name substances 'x' and 'y'. Ii. Name the processes occurring during the two changes. Iii. Write the chemical equations involved.

Answer 1

The brown substance' X' is copper .When it is heated copper oxide is formed . The reaction is as follows.It is a combination reaction. If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.

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