Which of the following is not correctly match | vedclass

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(D) . $ZnCO_3$ undergoes calcination to form $ZnO$,which is then reduced by carbon (smelting). This is correct.$B$. $Al(OH)_3$ is calcined to $Al_2O_3

Vedclass · Accepted Answer

$Cu_2S \rightarrow Cu$Roasting followed by carbon reduction

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(D) . $ZnCO_3$ undergoes calcination to form $ZnO$,which is then reduced by carbon (smelting). This is correct.$B$. $Al(OH)_3$ is calcined to $Al_2O_3$,which is then reduced by electrolytic reduction. This is correct.$C$. $PbS$ undergoes partial roasting to form $PbO$ and $PbSO_4$,which then react with remaining $PbS$ to give $Pb$ (self-reduction). This is correct.$D$. $Cu_2S$ undergoes partial roasting to form $Cu_2O$,which then reacts with remaining $Cu_2S$ to give $Cu$ (self-reduction). Carbon reduction is not used for $Cu_2S$. Thus,this is not correctly matched.

Which of the following is not correctly matched?

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