what happens when hydrogen is passed over heated black copper oxide
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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 the substance X and Y
II) Name the processes occuring during the two changes
iii) Write the chemical equtions involved
Smartlearning Expert22nd Aug 2013, 10:29 AM
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.
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 the substance X and Y
II) Name the processes occuring during the two changes
iii) Write the chemical equtions involved
Smartlearning Expert22nd Aug 2013, 10:29 AM
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.
Answered by
5
Answer:
Remains same
Explanation:
In the reaction copper oxide is-------
(c)Remains same
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