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  • What happens when (a) ZnCO3 is heated in the absence of oxygen(b) a mixture of Cu2O and Cu2S is heated

What happens when
(a) ZnCO3 is heated in the absence of oxygen?
(b) a mixture of Cu2O and Cu2S is heated

Answers (1)

Ans
(a) Calcination takes place
ZnCO_{3}\left ( s \right )\rightarrow ZnO\left ( s \right )+CO_{2}\left ( g \right )
When ZnCO3 is heated in the absence of oxygen, Zinc oxide and carbon dioxide are produced.
(b) Roasting takes place
2Cu_{2}O\left ( s \right )+Cu_{2}S\left ( s \right )\rightarrow 6Cu\left ( s \right )+SO_{2}\left ( g \right )
When a mixture of Cu2O and Cu2S is heated, copper metal and sulphur dioxide gas are produced

 

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