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CBSE Class 10 Answered

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
Asked by alvingigoisawesome | 08 Mar, 2019, 03:01: PM
answered-by-expert Expert Answer
The substance X is copper and substance Y is copper oxide.
 
When copper is heated in air, copper oxide is formed which is black colour compound.
 
2Cu + O2 → 2CuO
 
When hydrogen gas is passed over copper oxide, it reduced to copper again.
 
CuO + H2 → Cu + H2O
Answered by Varsha | 08 Mar, 2019, 06:36: PM
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