(D) In the extraction of copper from copper glance $(Cu_2S)$,the process involves roasting the ore in air to convert part of $Cu_2S$ into $Cu_2O$. The

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$Cu_2S \to Cu$: Roasting followed by carbon reduction

(D) In the extraction of copper from copper glance $(Cu_2S)$,the process involves roasting the ore in air to convert part of $Cu_2S$ into $Cu_2O$. Then,the remaining $Cu_2S$ reacts with $Cu_2O$ in a process known as self-reduction (or auto-reduction) to produce metallic copper $(Cu_2S + 2Cu_2O \to 6Cu + SO_2)$. Carbon reduction is not used for $Cu_2S$ because copper has a lower affinity for oxygen than carbon at high temperatures,and self-reduction is more efficient. Therefore,option $D$ is incorrectly matched.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Mix Examples of General Principles and processes of Isolation of Elements

Medium

Which of the following is not correctly matched?

A
$ZnCO_3 \to Zn$: Calcination followed by smelting
B
$Al(OH)_3 \to Al$: Calcination followed by electrolytic reduction
C
$PbS \to Pb$: Partial roasting followed by self reduction
D
$Cu_2S \to Cu$: Roasting followed by carbon reduction

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Class 12 Questions

Class 12

Chemistry Questions

Chapter

General Principles and Processes of Isolation of Elements

Subtopic

Mix Examples of General Principles and processes of Isolation of Elements

Match the items under List-$I$ with the compounds/elements from the List-$II$. Select the correct answer from the sets $(a), (b), (c)$ and $(d)$.
List-$I$ List-$II$
$(i)$ Explosive $(A)$ $NaN_3$
$(ii)$ Artificial gem $(B)$ $Fe_3O_4$
$(iii)$ Self reduction $(C)$ $Sn$
$(iv)$ Magnetic material $(D)$ $Al_2O_3$
$(E)$ $Pb(N_3)_2$
$(F)$ $Fe_2O_3$
$(G)$ $Cu$
$(H)$ $SiC$

List-$I$	List-$II$
$(i)$ Explosive	$(A)$ $NaN_3$
$(ii)$ Artificial gem	$(B)$ $Fe_3O_4$
$(iii)$ Self reduction	$(C)$ $Sn$
$(iv)$ Magnetic material	$(D)$ $Al_2O_3$
	$(E)$ $Pb(N_3)_2$
	$(F)$ $Fe_2O_3$
	$(G)$ $Cu$
	$(H)$ $SiC$

Medium

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Identify the reaction,which is not related to the extraction of copper.

MediumTS EAMCET 2025

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The percentage of silver in 'German silver' is:

Easy

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Given below are two statements:
Statement $I$: During electrolytic refining,the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement $II$: During the Hall-Heroult electrolysis process,purified $Al_2O_3$ is mixed with $Na_3AlF_6$ to lower the melting point of the mixture.
In the light of the above statements,choose the most appropriate answer from the options given below:

MediumJEE MAIN 2023

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Match List-$I$ with List-$II$ and select the correct answer using the codes given below the lists.

List-$I$ List-$II$

$I$. Cyanide process $A$. Ultrapure $Ge$

$II$. Floatation process $B$. Pine oil

$III$. Electrolytic reduction $C$. Extraction of $Al$

$IV$. Zone refining $D$. Extraction of $Au$

List-$I$	List-$II$
$I$. Cyanide process	$A$. Ultrapure $Ge$
$II$. Floatation process	$B$. Pine oil
$III$. Electrolytic reduction	$C$. Extraction of $Al$
$IV$. Zone refining	$D$. Extraction of $Au$