When hydrogen gas is passed over a black substance x the black coating turns brown due to oxidation or reduction
Answers
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
Answer:
Accepted Answer:
The brown substance' X' is copper .When it is heated copper oxide is formed .
Hence compound 'Y' is copper oxide.
The reaction is as follows.It is a combination reaction.
2Cu + O2 -----> 2CuO
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.
The chemical reaction is as follows
CuO + H2 ------>Cu + H2O
The second reaction is called oxidation-reduction reaction or redox reaction.
As during this reaction the copper(II) oxide is losing oxygen and is being reduced. The hydrogen is gaining oxygen and is being oxidised.In other words, one reactant gets oxidised while the other gets reduced.
Explanation:
I hope you understand