1
JEE Advanced 2019 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
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The cyanide process of gold extraction involves leaching out gold from its ore with CN$$-$$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s).
A
Q is O2
B
Z is [Zn(CN)4]2$$-$$
C
T is Zn
D
R is [Au(CN)4]$$-$$
2
JEE Advanced 2016 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-2
Extraction of copper from copper pyrite (CuFeS2) involves
A
crushing followed by concentration of the ore by froth flotation
B
removal of iron as slag
C
self-reduction step to produce ‘blister copper’ following evolution of SO2
D
refining of ‘blister copper’ by carbon reduction
3
JEE Advanced 2015 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2
Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is(are)
A
Impure Cu strip is used as cathode
B
Acidified aqueous CuSO4 is used as electrolyte
C
Pure Cu deposits at cathode
D
Impurities settle as anode – mud
4
JEE Advanced 2013 Paper 2 Offline
MCQ (More than One Correct Answer)
+3
-0.75
The carbon–based reduction method is NOT used for the extraction of
A
tin from SnO2
B
iron from Fe2O3
C
aluminium from Al2O3
D
magnesium from MgCO3.CaCO3
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