A reddish brown coloured metal, used in electrical wires, when powdered and heated strongly in an open china dish, its colour turns black. When hydrogen gas is passed over this black substance, it regains its original colour. Based on the above information answer the following questions. (i) Name the metal and the black coloured substance formed. (ii) Write balanced chemical equations for both the reactions..
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(i) the reddish brown coloured metal is copper metal (Cu).
When copper metal is heated in air, it forms black coloured compound. This black coloured compound is copper oxide or copper (II) oxide (CuO).
2Cu + O2 -------heat-------> 2CuO
case 2:
CuO + H2 ------------->Cu+H20
(i) the reddish brown coloured metal is copper metal (Cu).
When copper metal is heated in air, it forms black coloured compound. This black coloured compound is copper oxide or copper (II) oxide (CuO).
2Cu + O2 -------heat-------> 2CuO
case 2:
CuO + H2 ------------->Cu+H20
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Answer:
I hope you will like the answer.....
(i) the reddish-brown colored metal is copper metal (Cu).
When copper metal is heated in the air, it forms a black-colored compound. This black-colored compound is a copper oxide or copper (II) oxide (CuO).
2Cu + O2 -------heat-------> 2CuO
case 2:
CuO + H2 ------------->Cu+H20
Explanation:
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