Q 9. A brown substance ‘X’ on heating in air forms a substance ‘Y’. when hydrogen gas is passed over heated ‘Y’ , it again changes back into ‘X’. a) Name the substances ‘X’ and ‘Y’. b) Name the chemical processes occurring during the two changes. c) Write the chemical equations.
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a)substance X is copper and heating it in air it becomes copper oxide
oxidation is taking place in the first reaction . In the second reaction ,redox reaction is taking place
c) during heating:-
2Cu + O2 --------> 2CuO
When hydrogen gas is passed over black copper oxide then it turns brown as oxygen is removed by hydrogen.
2CuO + H2 -----> Cu + H20
oxidation is taking place in the first reaction . In the second reaction ,redox reaction is taking place
c) during heating:-
2Cu + O2 --------> 2CuO
When hydrogen gas is passed over black copper oxide then it turns brown as oxygen is removed by hydrogen.
2CuO + H2 -----> Cu + H20
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