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Q.

Pushpa took 3 𝑔 of copper powder in a china dish and heated it. She observed that the reddish brown surface of the copper powder becomes coated with a black substance. Based on her observation
(a) Identify the black substance.
(b) Explain the reason for the formation of black substance.
(c) Write the chemical equation of the reaction that takes place.
(d) Can the black coating on the surface be turned reddish brown? Explain.

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Detailed Solution

(a) The black substance is a copper oxide $(C u O)$

(b) The black substance has been formed due to the oxidation of copper powder.
(c) The chemical reaction follows;

$C u O (s) + H_{2} (g) \to C u (s) + H_{2} O (l)$

(d) This black coating can be removed by treating the black compound with hydrogen.

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Pushpa took 3 of copper powder in a china dish and heated it. She observed that the reddish brown surface of the copper powder becomes coated with a black substance. Based on her observation (a) Identify the black substance. (b) Explain the reason for the formation of black substance. (c) Write the chemical equation of the reaction that takes place. (d) Can the black coating on the surface be turned reddish brown? Explain.